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If the sun became a blackhole with the same amount of mass as it currently has, we would continue our orbit.
It would be night all the time without moonlight.
Is all the heat we get from the sun in the form of infrared light, and if so, wouldn’t we loose all of that if the sun turned into a black hole? Night all the time would be fine, but loosing warm temperatures would not be fun.
Not all, but most of it is from infrared, with a little under half of all light recieved from the sun being infrared.* But yes, we would lose our only source of renewable energy and eventually either freeze or starve to death.
*Based on a quick skim of a Wikipedia article