We know that regular supernovas pose no existential threat to life on Earth in the near-term. But there are other varieties ...

Decades of constant X-ray emission from the Helix Nebula’s white dwarf suggest debris from a Jupiter-sized planet steadily rains upon the star.

White! It certainly appears white ... When the Sun is lower in the sky, it casts a golden light because of the scattered rays. That golden hue is reflected off the snow, making it a little ...