Our sun is 8 minutes away, if you travel as fast as light does.
The next nearest star is almost 4 years away if you travel as fast as light does.
Just doing a naive calculation here.. the heat we get from that star is probably somewhere around 262,800x less than the heat we we get from our sun.
(4 x 365 x 24 x 60 / 8 = 262,800)
Edit: factor of 8
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