do we live in the milky way?
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We live in one of the arms of a large spiral galaxy called the Milky Way. The Sun and its planets (including Earth) lie in this quiet part of the galaxy, about half way out from the centre.
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The Sun has a nearly circular orbit as it goes around the center of the Milky Way Galaxy, and lies in the Galaxy's disk. The speed of the Sun in its orbit is ~200 kilometers per second, which means it takes us approximately 225 million years to go once around the center of the Galaxy.
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The stars we see in our night sky are all members of our Milky Way galaxy. All of these stars are moving through space, but they're so far away we can't easily see them move relative to each other. That's why the stars appear fixed relative to each other.
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The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way.
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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. And it's all held together by gravity.
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More by Marilyn More stars are indeed visible with the unaided eye from the southern hemisphere, but not because more stars exist in that direction of the universe. The reason is that the South Pole is oriented toward the center of the Milky Way, our own galaxy.
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We're still producing new stars, however. Even though approximately one new Sun's mass worth of stars forms per year in our galaxy, they mostly occur in dense clouds in the galactic plane or, in smaller extents, in the central bulge.
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We're about 26,000 light-years from the center of the galaxy, on the inner edge of the Orion-Cygnus Arm. It's sandwiched by two primary spiral arms, the Sagittarius and Perseus Arms. The artists' concepts above and below show the Orion-Cygnus Arm, the home spiral arm of our sun in the Milky Way galaxy.
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All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area. ... Our Solar System is about 25,000 light years away from the center of our galaxy – we live in the suburbs of our galaxy.
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About 10% of stars in the Milky Way are dwarf yellow. They have a surface temperature of about 6000 ° C and shine a bright yellow, almost white. At the end of his life, a yellow dwarf star becomes a red giant and white dwarf.
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Until relatively recently, it was thought that our neighboring galaxy, Andromeda, was far larger than the Milky Way. But the Milky Way is, in fact, considerably larger than Andromeda.
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So far, astronomers have found more than 500 solar systems and are discovering new ones every year. Given how many they have found in our own neighborhood of the Milky Way galaxy, scientists estimate that there may be tens of billions of solar systems in our galaxy, perhaps even as many as 100 billion.
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Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them!
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The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
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Assuming there are 200 billion stars in the Milky Way, it can be hypothesized that there are 11 billion potentially habitable Earth-sized planets in the Milky Way, rising to 40 billion if planets orbiting the numerous red dwarfs are included.
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No, not all stars are in a galaxy. They may have once belonged to a galaxy, but they are not a part of it any more. Some of these so-called "stellar outcasts" or "intergalactic stars" have actually been observed by NASA's Hubble Space Telescope.
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Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call "solar." Our planetary system is located in an outer spiral arm of the Milky Way galaxy.