The massive star that exploded to form the supernova known as Cassiopeia A most likely had a companion star that has yet to be spotted, a spectroscopic analysis by RIKEN astrophysicists suggests. This will provide fresh impetus to efforts to locate the companion.
Rare-metal abundance points to a missing companion star for the supernova Cassiopeia A
- 3. 7 2020 (15:20)