As we zoom in more and more galaxies become apparent in all their splendor. On that scale with our solar system in your hand the milky way galaxy with its 200 400 billion stars would span north america see the illustration on the right.
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For the outer planets jupiter and saturn are gas giants and uranus and neptune are ice giants.
Galaxy planets universe. The discovery of the nature of galaxies as distinct from other nebulae interstellar clouds was made in the 1920s. The milky way is big but some galaxies like our andromeda galaxy neighbor are much larger. There are about 51 galaxies in the local group see list of nearest galaxies for a complete list on the order of 100 000 in our local supercluster and an estimated one to two trillion in all of the observable universe.
Galaxies come in many sizes. Moons planets solar system stars galaxies in our universe an introduction by rick kang education public outreach coord. Link to this page print.
All four are composed mainly of hydrogen and helium but the more distant two have more ice. In galaxies the solar systems are separated by vast sections of mostly empty space. The galaxy that contains the earth and its solar system is called the milky way.
Nasa s telescopes allow us to study galaxies beyond our own in exquisite detail and to explore the most distant reaches of the observable. A galaxy is a large collection of stars gas and dust kept together by gravity. The four inner planets of the solar system mercury venus earth and mars are terrestrial planets composed primarily of rock and metal.
If the universe is like our planet. The universe is all of the galaxies billions of them. The word galaxy is derived from the greek galaxias γαλαξίας literally milky a reference to the milky way.
Solar systems orbit around their galaxies just as planets orbit around their suns. A galaxy is a gravitationally bound system of stars stellar remnants interstellar gas dust and dark matter. This galaxy is thought to contain more than 200 billion different stars.
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