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A star ends its life as one of these two. In the universe they coexist although they are very different from each other.
Tags: astronomy, space, science, universe, stars
Tags: astronomy, astrophysics, cosmos, galaxy, physics
Since nothing can travel faster than light, the ultimate speed limit is C (~300,000,000 meters per second)
Tags: science, physics, relativity, light, einstein
Tags: einstein, light, physics, relativity, space
Tags: albert einstein, einstein, light, physics, relativity
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