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| big bang theory |
the theory that the universe originated at a fixed point billions of years ago in a cosmic explosion of a mass of hydrogen atoms, and that it has been expanding ever since. (Cf. steady state theory.) |
| solar flare |
a short intense outburst of solar gases, often near sunspots, accompanied by cosmic rays, x-rays, and magnetic storms. |
| universal |
of or relating to the universe; cosmic. [1/6 definitions] |
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