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| + | A '''Galaxy''' can be roughly defined as a collection of 10^7 to 10^12 gravitationally-bound [[star]]s. Our [[sun]] is in a galaxy that is called the "[[Milky Way]]". |
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| + | ==About galaxies== |
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| ⚫ | Galaxies vary in size and shape, some are elliptical <ref>[http://www.enchantedlearning.com/subjects/astronomy/stars/galaxy/elliptical.shtml Elliptical Galaxies]</ref>, some are spiral <ref>[http://www.enchantedlearning.com/subjects/astronomy/stars/galaxy/spiral.shtml Spiral Galaxies]</ref> and some are irregular <ref>[http://www.enchantedlearning.com/subjects/astronomy/stars/galaxy/irregular.shtml Irregular Galaxies]</ref>. Galaxies contain stars, [[planet]]s, [[black hole]]s, interstellar gas and dust as well as other objects like [[comet]]s. New stars form from the gas and dust in a galaxy. Astronomers believe that at the centre of every galaxy is one terrifyingly large [[black hole]]. |
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| + | ==Starlight problem== |
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Light from distant galaxies has been traveling for millions of years, hundreds of millions of years and thousands of millions of years to reach [[Earth]]. The existence of light that has been traveling for a very long time is yet more evidence against [[Young Earth Creationism]], this is known as the starlight problem. <ref>[http://rationalwiki.org/wiki/Starlight_problem Starlight problem]</ref> |
Light from distant galaxies has been traveling for millions of years, hundreds of millions of years and thousands of millions of years to reach [[Earth]]. The existence of light that has been traveling for a very long time is yet more evidence against [[Young Earth Creationism]], this is known as the starlight problem. <ref>[http://rationalwiki.org/wiki/Starlight_problem Starlight problem]</ref> |
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Revision as of 08:09, 7 November 2012
A Galaxy can be roughly defined as a collection of 10^7 to 10^12 gravitationally-bound stars. Our sun is in a galaxy that is called the "Milky Way".
About galaxies
Galaxies vary in size and shape, some are elliptical [1], some are spiral [2] and some are irregular [3]. Galaxies contain stars, planets, black holes, interstellar gas and dust as well as other objects like comets. New stars form from the gas and dust in a galaxy. Astronomers believe that at the centre of every galaxy is one terrifyingly large black hole.
Starlight problem
Light from distant galaxies has been traveling for millions of years, hundreds of millions of years and thousands of millions of years to reach Earth. The existence of light that has been traveling for a very long time is yet more evidence against Young Earth Creationism, this is known as the starlight problem. [4]
See Also
How Conservatives see Galaxies
References
External links
Videos
- Alien Galaxies (1 of 5) Video about galaxies
- How the Andromeda Galaxy Works
- How the milky way will end Other scientists claim the two galaixies will merge to form one giant eliptical galaxy. [1]