Krypton was a planet that was 27.1 light years away from Earth, found in the Corvus constellation. Home to Kryptonians, these humanoids evolved under a much more dense gravity and beneath a Red Sun, dubbed LHS 2520 by humans but known to Kryptonians as Rao.
To humans, the 1980s was when the planet Krypton began to end. Though Krypton was actually thousands of light years away, when it did finally end it was able to rocket Kal-El to Earth, landing in the early 1980s. It took over twenty years for Krypton's explosion to be visible on Earth, though. Several other Kryptonians survived either through the method of the Phantom Zone, the Collector of Worlds or through stasis in space.