Very low. Such a companion would have been detected by now, even if only through its gravitational effects.
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The probability is a 50/50 percent chance that the sun will rise.
It is 0. The sun will eventually expand into a red giant and "swallow" the earth but that is not the same as crashing into it.
because the sun is a star
The probability is 0.The probability is 0.The probability is 0.The probability is 0.
The probability is 1.The probability is 1.The probability is 1.The probability is 1.