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.
there are 10 raise to power 11 galaxies consisting of 10 raise to power 11 stars... so if around every star an earth like planet exists the probability goes to 10 raise to power 22