How far away is the nearest #supernova?
In the night sky in the Pegasus constellation, one can see the double star IK Pegasus, 150 light years from Earth, with the naked eye. One of the stars of this system, the white dwarf IK of Pegasus B, is the closest candidate for supernovae.
One of the models for the further evolution of this binary system assumes that when one of the stars begins to turn into a red giant, its envelope can grow to a considerable size 100 times the current radius. When the giant's outer shell reaches its companion, IK Pegasus B, mass transfer will begin between the stars, which will lead to the accumulation of gas consisting of hydrogen and helium on the surface of the white dwarf.
The gas accumulated on the surface of the white dwarf will begin to shrink and heat up, and then in the accumulated gas the conditions necessary for the thermonuclear burning of hydrogen may develop, which will lead to powerful thermonuclear explosions.
Fortunately for us, the Pegasus IK dual system is not dangerous, since its further evolution is not expected in the near future, and this system is moving away from us at high speed
The image shows how a white dwarf accumulates gas through mass exchange with a second #star.