A new X-ray look at the mesmerizing Helix Nebula reveals an alleged planet killer: a white dwarf that might be the source of ...

NASA affectionately calls it a “Space Butterfly,” but in reality it’s a pair of massive gas clouds. Its official name is Westerhout 40 (W40), and it’s a nebula. W40 and nebulas like it are ...

These were from the central white dwarf of the Helix Nebula. The origin was unknown for years. Recent observations have changed the perspective. Scientists used images from the Hubble and NASA's ...