The Milky Way is a barred spiral galaxy around 13.6 billion years old with large pivoting arms stretching out across the cosmos. Milky Way quick facts: – Galaxy type: Barred spiral – Age:...Ricardo Ramírez Reyes (Universidad de Chile) A planet five times the size of Earth was found to be the shiniest planet outside our solar system. Its mirror-like layer of clouds is laced with...The new estimate reduces that measurement by half, indicating the diameter of Sgr A*, as the object is known, is about 93 million miles -- same as the distance between Earth and the Sun. The...That's a diameter of 540 sextillion (or 54 followed by 22 zeros) miles. ... Our galaxy, the Milky Way, is racing away from others around it as the Universe expands (Credit: ...Transcribed Image Text: Use this table of magnitudes to determine the following. (a) What is the ratio of the distance to the nearest galaxy to the diameter of the Milky Way Galaxy? This is typical of the distances between galaxies as compared to their diameters. dMW X Your answer cannot be undekstood or graded.Moreover, as most disc galaxies are barred, we should expect the same from the Milky Way. The various evidences are: The observed light distribution (2MASS) shows a left-right asymmetry in brightness and the vertical height. This is explained by the near end of the bar being located on that side. The distribution of magnitudes of red-clump ...Tell me more about galaxies It is very difficult to count the number of stars in the Milky Way from our position inside the galaxy. Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars. These stars form a large disk whose diameter is about 100,000 light years.Assuming that the globular clusters outlined the Galaxy, he determined that it has a diameter of about 100,000 light-years and that the Sun lies about 30,000 light-years from …The Milky Way is a huge city of stars, so big that even at the speed of light, it would take 100,000 years to travel across it. All the stars in the night sky, including our Sun, are just some of the residents of this galaxy, along with millions of other stars too faint to be seen. The further away a star is, the fainter it looks. (two points) The Andromeda galaxy is moving toward the Milky Way at a speed of 110 kilometers per second! The Andromeda Galaxy is 2.54 x 10° light years from the Milky Way. a) How does this distance compare with the diameter of the Milky Way? If we used the Milky Way's diameter as a measuring stick, how many "Milky Ways" away is it?Instead of extending nearly 100,000 light-years from one side to the other, it would be more like 160,000 light-years wide. This brings the Milky Way's size up to that of Andromeda. The Milky Way ...Measuring the Milky Way If you look in any astronomy textbook, you'll find somewhere a diagram of the Milky Way Galaxy with dimensions: the disk of our galaxy is about the disk is about 40,000 parsecs = 40 kilo-parsecs = 40 kpc across, and the Sun is about 8,000 parcsec = 8 kpc from the center.April 2, 2019, 00:00 PDT Our Milky Way Galaxy: How Big is Space? Pat Brennan, NASA's Exoplanet Exploration Program Our Milky Way Galaxy: How Big is Space? Share Watch on Make the jump to light-years as we cruise through the Milky Way galaxy. Video credit: NASA/JPL-Caltech.The new estimate reduces that measurement by half, indicating the diameter of Sgr A*, as the object is known, is about 93 million miles -- same as the distance between Earth and the Sun. The...200,000 light-years The Milky Way is a barred spiral galaxy with an estimated visible diameter of 100,000–200,000 light-years. Recent simulations suggest that a dark matter disk, also containing some visible stars, may extend up to a diameter of almost 2 million light-years.Created by kathryn_ann_waller Terms in this set (67) 1) What is the diameter/thickness of the disk of the Milky Way? A) 100 light-years B) 1,000 light-years C) 10,000 light-years D) 100,000 light-years E) 1,000,000 light-years D 3) What kinds of objects lie in the halo of our galaxy? A) open clusters B) O and B stars C) globular clusters The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years (1,100 parsecs) across and approximately 10,000 light-years (3,100 parsecs) in length, [2] containing the Solar System, including Earth.Our solar system's largest planet is an average distance of 484 million miles (778 million kilometers) from the Sun. That's 5.2 AU. Jupiter is the largest of the planets, spanning nearly 1.75 millimeters in …Aug 7, 2017 · The center of the Milky Way galaxy, with the supermassive black hole Sagittarius A* (Sgr A*), located in the middle, is revealed in these images. As described in our press release, astronomers have used NASA’s Chandra X-ray Observatory to take a major step in understanding why material around Sgr A* is extraordinarily faint in X-rays. Anatomy of the Milky Way. An artist's impression of our Milky Way galaxy, a roughly 13 billon-year-old 'barred spiral galaxy' that is home to a few hundred billion …With a scale height of about 400 light years and scale length of about 10,000 light years, the disk of the Milky Way rotates about Galactic centre at about 220 km/sec. In addition, its outer regions appear to be warped, a phenomenon that occurs in about 50% of spiral galaxies. Jul 18, 2023 · Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from... Hercules A has an estimated diameter of 1.5 million light-years, and like IC 1101, it is classified as a supergiant elliptical galaxy. Other than its size and galaxy type, not much is known about Hercules A, and there is a reason for this.Black hole: First picture of Milky Way monster. Published. 12 May 2022. Share. close panel. Share page. Copy link. ... For scale, the ring has diameter of about 60 million km (40 million miles).Nov 9, 2019 · The Milky Way is an averagely large galaxy with a diameter of 100 000 light years and about 200 billion to 400 billion stars; but compared to larger galaxies like M100, M 87, NGC 4921 or Hercules A, the Milky Way looks like a dwarf galaxy. Feb 11, 2016 · Explanation: The precision in the measurements in ly is now limited to 2 significant digits (sd) only. !5 became 13, in 10000 ly as unit..After confirming these digits, the march would be towards lower-valued sd, using further advances in theory, instrumentation and technology. Answer link If the Milky Way’s diameter was the same as that of a Frisbee, the disk would be as thick as a sheet of paper. Fact 35. Two other galaxies are close to the Milky Way beside They are the Large Magellanic Cloud and Small Magellanic Cloud, which are about 170,000 light years away and 200,000 light years ways from the Milky Way, respectively ...Jul 18, 2023 · Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from... Mathematics Middle School answered • expert verified Our galaxy, the Milky Way, has a diameter of about 1x10^21 meters.the largest galaxy known to man, the ic 1101, has a diameter of 5x10^22 meters. The diameter of the ic 1101 is about how many times greater than the diameter of the Milky Way ? See answers Advertisement ewomazinoadeAnatomy of the Milky Way. An artist's impression of our Milky Way galaxy, a roughly 13 billon-year-old 'barred spiral galaxy' that is home to a few hundred billion stars. On the left, a face-on view shows the spiral structure of the Galactic Disc, where the majority of stars are located, interspersed with a diffuse mixture of gas and cosmic ...A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. [1] [2] The word is derived from the Greek galaxias ( γαλαξίας ), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, [3] range in size ... Our galaxy, the Milky Way, has a diameter of about 1.2 times 10^5 light years. As far as an astronaut is concerned, how long (in years) would it take to cross the Milky Way, if the speed of the spacec; The Hubble constant is about 70 km/s/Mpc, which means that a galaxy traveling at 3500 km/s away from the Milky Way is about 50 Mpc away.guitar center burlington
The stellar disk of the Milky Way Galaxy is approximately 100,000 light-years (9×1017 km) (6×1017 mi) in diameter, and is considered to be, on average, about 1,000 light-years (9×1015 km) thick.The Sun's location in the Milky Way Galaxy is _________. in the galactic disk, roughly halfway between the center and the outer edge of the disk. The Sun lies about 27,000 light-years from the center of the galaxy, which is just over half the roughly 50,000 light-year radius of the disk. What do we mean by the interstellar medium?Step-by-step explanation. 1) The ratio of diameter and thickness is: R = td = 1000lightyears100000lightyears R = 1100 R = 100: 1 . 2) A compact disk is an everyday object that has the same ratio as of the Milky Way. A standard CD has a diameter of 120 mm and a thickness of 1.2 mm. So, the diameter to the thickness ratio will be:Diameter: 100-180 kilometers What is the Milky Way? The Milky Way is the galaxy that contains the Solar System where the planet Earth is located. It has a spiral shape and its diameter is estimated at 100,000 light years, with a mass that exceeds two billion times the Sun's mass. For comparison, the diameter of the Milky Way's disk has long been thought to be only about half that: around 100,000 light-years. And in terms of the stars present, ...In order to determine how many times larger the diameter of the ic 1101 is greater than the diameter of the Milky way, we would divide the diameter of the ic 1101 by the diameter of the Milky way. Diameter of the ic 1101 / diameter of the Milky way. 5x10^22 ÷ 1x10^21. 5 ÷ 1 = 5 . 10^22 - 10^21 = 10^1. 5 x 10^1 = 50Diameter: 100-180 kilometers What is the Milky Way? The Milky Way is the galaxy that contains the Solar System where the planet Earth is located. It has a spiral shape and its diameter is estimated at 100,000 light years, with a mass that exceeds two billion times the Sun's mass. The galaxy in the image is a reconstruction of the Milky Way, if it were about 110,000 light-years in diameter (more recent research suggests it's even bigger than that). The itsy bitsy blue dot is how far our radio signals have travelled from Earth - a diameter of about 200 light-years. The invention of radio was the work of many great minds ...Milky Way Galaxy - Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by establishing the spatial distribution of globular clusters. Shapley found that, instead of a relatively small system with the Sun …Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from...made with synonym
With a scale height of about 400 light years and scale length of about 10,000 light years, the disk of the Milky Way rotates about Galactic centre at about 220 km/sec. In addition, its outer regions appear to be warped, a phenomenon that occurs in about 50% of spiral galaxies.So in miles our Milky Way is D = 6E12*10E4 = 60E16 miles in diameter. In case so-called scientific numbers are not your thing, that's 60 with sixteen zeros following it or 600,000,000,000,000,000 ...Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from...Feb 9, 2022 · The king gave him money to build telescopes, including his 40-foot-long (12 meters) telescope with a 48-inch mirror. With it, Herschel produced perhaps the first systematic map of the Milky... The Size of the Milky Way Galaxy - YouTube Come join me as I learn and explore the milky way galaxy.Sources:"Mountain Emperor" Kevin MacLeod (incompetech.com)Licensed under Creative... The observable Universe is 93 billion light-years, yet, our galaxy, the Milky Way, is just 100,000 light-years in diameter. It would take us endless generations just to explore our galaxy, let alone the Universe. Another ancient structure is the galaxy supercluster known as the Hyperion Supercluster.Structure of the Milky Way. January 11, 2023 / Emma. In the vast expanse of the cosmos, the Milky Way Galaxy is our home. You’ve no doubt seen images of the Milky Way and similar galaxies elsewhere online. It’s a large, spiral galaxy, one of the most spectacular galactic shapes. That spiral shape is fairly iconic–and for years, that’s ...The diameter of our disk-shaped galaxy, the Milky Way, is about 1.7E+5 light-years (ly). The distance to the Andromeda galaxy, which is the spiral galaxy nearest to the Milky Way, is about 1.9E+6 ly. Our Milky Way galaxy is 100,000 ly in diameter. A spaceship crossing the galaxy measures the galaxy's diameter to be a mere 1 ly.The Milky Way is a spiral galaxy. We believe that it consists of a central bulge, 4 major arms, and several shorter arm segments. The Sun (and, of course, the rest of our solar system) is located near the Orion arm, between two major arms (Perseus and Sagittarius). The diameter of the Milky Way is about 100,000 light-years and the Sun is ...The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years (1,100 parsecs) across and approximately 10,000 light-years (3,100 parsecs) in length, [2] containing the Solar System, including Earth. jobs craigslist ny
Cosmic yardsticks. The debate about the physical nature of the Milky Way continued into the early 20th century. Two new technologies helped charge the discussion: spectroscopy and photography.Diameter: 100-180 kilometers What is the Milky Way? The Milky Way is the galaxy that contains the Solar System where the planet Earth is located. It has a spiral shape and its diameter is estimated at 100,000 light years, with a mass that exceeds two billion times the Sun's mass.Created by kathryn_ann_waller Terms in this set (67) 1) What is the diameter/thickness of the disk of the Milky Way? A) 100 light-years B) 1,000 light-years C) 10,000 light-years D) 100,000 light-years E) 1,000,000 light-years D 3) What kinds of objects lie in the halo of our galaxy? A) open clusters B) O and B stars C) globular clusters Measuring the Milky Way If you look in any astronomy textbook, you'll find somewhere a diagram of the Milky Way Galaxy with dimensions: the disk of our galaxy is about the disk is about 40,000 parsecs = 40 kilo-parsecs = 40 kpc across, and the Sun is about 8,000 parcsec = 8 kpc from the center.Milky Way Galaxy - Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by establishing the spatial distribution of globular clusters. Shapley found that, instead of a relatively small system with the Sun near its centre, as had previously been thought ...It is approximately 78000 light years away and about 10000 light years in diameter. It is orbiting our galaxy in a period of about 1 billion years but it cannot be expected to last much longer, in a few hundred million years it will be ripped apart by our own galaxy. It contains about one hundred million stars. Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. Previously, our galaxy was thought to possess four major arms. The annotated artist's concept illustrates the new view of the …The diameter has been measured to be about 100,000 light-years. One light year is the distance at which light travels in a year (9.46 trillion kilometers). The diameter of the …Study with Quizlet and memorize flashcards containing terms like How does the diameter of the disk of Milky Way Galaxy compare to its thickness?, What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the Milky Way Galaxy?, The Sun's location in the Milky Way Galaxy is _____. and more.How does the diameter of the disk of the Milky Way Galaxy compare to its thickness? A) The diameter is about 100,000 times as great as the thickness. B) The diameter and thickness are roughly equal. C) The diameter is about 100 times as great as the thickness. D) The diameter is about 10 times as great as the thickness.Jan 27, 2023 · A few years ago astronomers discovered that the Milky Way is a barred spiral galaxy. This means a “bar” of stars runs across its center, and the spiral arms extend from either end. Barred ... The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years (1,100 parsecs) across and approximately 10,000 light-years (3,100 parsecs) in length, [2] containing the Solar System, including Earth.captain of industry nuclear power
Oct 8, 2019 · The radius of the Milky Way is estimated to be around 52.850 light-years. The Milky Way is believed to be around 12 billion years old. There are around 40 billion exoplanets (planets that orbit other stars) similar to the size of Earth orbiting in the habitable zones of their sun-like stars. Diameter: 100-180 kilometers What is the Milky Way? The Milky Way is the galaxy that contains the Solar System where the planet Earth is located. It has a spiral shape and its diameter is estimated at 100,000 light years, with a mass that exceeds two billion times the Sun's mass. Study with Quizlet and memorize flashcards containing terms like How does the diameter of the disk of Milky Way Galaxy compare to its thickness?, What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the Milky Way Galaxy?, The Sun's location in the Milky Way Galaxy is _____. and more.The Milky Way consists of a fairly flat disk about 120,000 light years in diameter and 1,000 light years thick. (A light year is the distance light travels in one year, about six trillion miles.) The edge of the galaxy has a fuzzy rather than a sharp boundary, so the size estimates depend on what one calls the edge.Introduction. Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon; if not blocked by the horizon, it would be seen as a circle around the entire sky. Although its motion is not readily apparent, the entire galaxy is rotating about the Milky Way's ...The precise diameter is 1.9 million light-years, give or take 0.4 million light-years, the team reports February 21 in a paper posted at arXiv.org. To put that size into …The Milky Way. Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark matter as all the stars and gas put together. …The Milky Way galaxy is made of billions of stars, and gas and dust, all bound together by mutual gravitational attraction, as well as a lot of dark matter. The diameter of our galaxy is about 100,000 light years [e1] across (the visible material at least – the dark matter halo goes beyond that).What is the diameter of the Milky Way in light years? Astronomy Stars, Black Holes, and Galaxies Our Galaxy: The Milky Way 1 Answer A. S. Adikesavan Feb 11, …In 2008, astronomers Reinhard Genzel and Andrea Ghez determined Sagittarius A* to have a mass 4.3 million times that of the sun. Astronomers have also calculated that the diameter of the Milky Way ...Nov 8, 2017 · Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. Previously, our galaxy was thought to possess four major arms. The annotated artist's concept illustrates the new view of the Milky Way. But these black holes are nothing compared to supermassive black holes, like Sagittarius A*, which lives at the center of our Milky Way galaxy. It covers a region about 14.6 million miles in diameter.Jul 18, 2023 · Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from... Our solar system's largest planet is an average distance of 484 million miles (778 million kilometers) from the Sun. That's 5.2 AU. Jupiter is the largest of the planets, spanning nearly 1.75 millimeters in …guest service agent hilton salaryThe Milky Way is approximately 100,000 light-years in diameter. Our solar system is 26,000 light-years from the center of the Galaxy. All objects in the Galaxy revolve around the Galaxy's center. It takes 250 million years for our Sun (and the Earth with it) to make one revolution around the center of the Milky Way.Jul 18, 2023 · Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from... What is the approximate diameter of the Milky Way Galaxy in light-years? 100,000 What fraction of the Galaxy's mass is in a form that does not emit electromagnetic radiation? about 90% The Sun lies _______ the disk of our Milky Way Galaxy. about half of the way out in Who was the first to measure the structure of Milky Way using globular clusters? The galaxy is surrounded by a huge hot-gas halo that is several hundreds of thousands of light-years in diameter. ... Many of the Milky Way's stars, however, are tough to view.The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way. At a distance of around 50 kiloparsecs (160 kly), the LMC is the second- or third-closest galaxy to the Milky Way, after the Sagittarius Dwarf Spheroidal (c. 16 kpc (52 kly) away) and the possible dwarf irregular galaxy called the Canis Major Overdensity.Based on the D 25 isophote at the B …Milky Way Galaxy - Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by establishing the spatial distribution of globular clusters. Shapley found that, instead of a relatively small system with the Sun near its centre, as had previously been thought ... If the Milky Way had the same diameter as a Frisbee, the thickness of the disk would be about that of a sheet of paper. [3] All galaxies are not alike, but most fit into one of three main groups: 1) spiral galaxies (such as the Milky Way), 2) elliptical galaxies, and 3) and irregular galaxies.The Milky Way is a huge disk, roughly 100,000 to 120,000 light years across. ... but there is a spheroidal bulge at the center of the galaxy that is 12,000 light years in diameter.Ricardo Ramírez Reyes (Universidad de Chile) A planet five times the size of Earth was found to be the shiniest planet outside our solar system. Its mirror-like layer of clouds is laced with... The Milky Way consists of a fairly flat disk about 120,000 light years in diameter and 1,000 light years thick. (A light year is the distance light travels in one year, about six trillion miles.) The edge of the galaxy has a fuzzy rather than a sharp boundary, so the size estimates depend on what one calls the edge.May 13, 2022 · May 13, 2022 The Milky Way's Black Hole There's a black hole at the center of the Milky Way. Stars are observed to orbit a very massive and compact object there known as Sgr A* (say "sadge-ay-star"). Tell me more about galaxies It is very difficult to count the number of stars in the Milky Way from our position inside the galaxy. Our best estimates tell us that the Milky Way is made up of approximately 100 billion stars. These stars form a large disk whose diameter is about 100,000 light years.1. If one light year is about 9.5 x 10 15 meters, what is the approximate diameter of the Milky Way galaxy? a) 950,000,000,000,000,000,000 meters b) 950,000,000,000,000 meters c) 9.5 x 10 20 meters d) both a and c are correct. 2. The Milky Way galaxy is: a) considered a small cluster of stars b) a spiral galaxy similar to the Andromeda galaxyuc path log in
The mass of the Milky Way, visualized. To visualize the mass of 1.5 trillion suns, let’s start small. This is the Earth. It has a mass of 5.972 × 10^24 kilograms. This is the Earth compared to ...Betelgeuse is one of the most popular stars in the Milky Way. In fact, it is one of the only stars other than our sun where astronomers have actually photographed the star’s surface. Betelgeuse is one of the largest stars in our galaxy with a diameter 887 times larger than the sun’s.The galaxy we live in, called the Milky Way Galaxy, is a barred spiral galaxy composed of at least 100 billion stars. It is approximately 100,000 light years across and about 1000 light years thick. It has a central bulge that is about 10,000 light years in diameter. Our solar system is about a third of the way towards the edge of the Galaxy ...Studying 136 planetary nebulas in the thickest part of the Milky Way, the galactic bulge, with the Very Large Telescope (VLT), the team discovered that each is unrelated and comes from...What is the approximate diameter of the Milky Way Galaxy in light-years? 100,000 What fraction of the Galaxy's mass is in a form that does not emit electromagnetic radiation? about 90% The Sun lies _______ the disk of our Milky Way Galaxy. about half of the way out in Who was the first to measure the structure of Milky Way using globular clusters? astronomy - Astronomy - Herschel, Milky Way, Stars: Although Herschel’s discovery of Uranus made his reputation, it was far from being his most important contribution. During the 18th century, astronomers had …May 4, 2015 · published 4 May 2015 The disk of the Milky Way Galaxy disk may actually be rippled. (Image credit: Heidi Newberg) Two ringlike structures of stars wrapping around the Milky Way's outer disk... The Milky Way is our home galaxy.It contains around 400 billion stars, including our Sun.. The Milky Way has a diameter of about 170,000 or 200,000 light years, and is a barred spiral galaxy.The idea that the Milky Way is made of stars goes back to the Ancient Greek philosopher Democritus.. The Milky Way has three main parts: a disk, where the Solar …booster appointment at cvs
Cosmic yardsticks. The debate about the physical nature of the Milky Way continued into the early 20th century. Two new technologies helped charge the discussion: spectroscopy and photography.Study with Quizlet and memorize flashcards containing terms like How does the diameter of the disk of Milky Way Galaxy compare to its thickness?, What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the Milky Way Galaxy?, The Sun's location in the Milky Way Galaxy is _____. and more.The Milky Way Galaxy The major arms consist of the highest densities of both young and old stars; the minor arms are primarily filled with gas and pockets of star-forming activity. The artist's concept also …Question 76625: The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way? 900,000 years 90,000 years 9,000 years 900 years Answer by bucky(2189) (Show Source):