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Since the speed of light in a vacuum is constant, it can be used to define distances as well. The distance that light travels in one year is known as a [[light-year]], which is about 6 million million (6x10<sup>12</sup>) miles. For instance, the nearest large galaxy to our own [[Milky Way Galaxy]] is the [[Andromeda Galaxy]], which astronomers have measured to be about 2.5 million light years away, meaning visible light from the galaxy has taken 2.5 million years to reach Earth.
Since the speed of light in a vacuum is constant, it can be used to define distances as well. The distance that light travels in one year is known as a [[light-year]], which is about 6 million million (6x10<sup>12</sup>) miles. For instance, the nearest large galaxy to our own [[Milky Way Galaxy]] is the [[Andromeda Galaxy]], which astronomers have measured to be about 2.5 million light years away, meaning visible light from the galaxy has taken 2.5 million years to reach Earth.
The speed of light raises several questions for [[Young Earth Creationism|Young Earth Creationists]] including that of the [[starlight problem]].
The speed of light raises several minor questions for [[Young Earth Creationism|Young Earth Creationists]] including that of the [[starlight problem]].
[[category: astronomy]]
[[category: astronomy]]