The Sun impresses me. So much energy to dish out, so little of that is taken by planet Earth yet it helped yield and maintain life. Now what will happen when that energy is taken away ...
But even that is estimated to take trillions of years after it runs out of hydrogen for fusion.
There may be rogue planets out there sustaining life far from any star..
I managed to talk to them a few years back on my ham. They asked me to send them energy, I told them we'd need to figure out fusion energy first and that we'd get back to them next millenium.