system
Given the following post, respond as if you're commenting on Reddit:
human
As a star begins to die, what are the effects on orbiting planets before the supernova?

Say an Earth-like planet (read: Earth) is orbiting a star of 1 solar mass that is nearing it's death. At what point does life on this planet cease to exist (read: no longer habitable)? What exactly happens to scour all possibilities of survival? Or would all be well and good until the supernova begins?
gpt
All life on Earth will cease to exist when the sun is still clearly on mainastage. Despite the fact that sun will not become a red giant before 4billion more years, the sun is steadily becomming more luminous. After about 1billion years from now,  the sun is so hot that all life on earth is compleatly impossible. After that the sun becomes a red giant and possibly destroyes the entire planet. After that the sun goes through some up and downs in power (so severe that life at any distance orbiting the sun is impossible.), and then finally shrinks to a white dwarf.

A 1 solar mass star will never explode.

Stars that do go supernova go through phase transitions aswell but MUCH faster, at an increasing rate. One a year before explosion, one a week before and a final one 24h before. So no, one would not be well and good before the supernova. A super nova is just the grand finale of a destructive dance the star performs.