The team calculated light curves of metal - poor supernova, produced by blue supergiant stars, and «metal - rich» red supergiant stars. (sciencedaily.com)
Astronomers have been searching for blue supergiants for decades. (sciencemag.org)
«Cosmic lens helps Hubble capture image of most distant star ever seen: Gravitational lensing by sun - like star in massive cluster reveals blue supergiant 9 billion light years away.» (sciencedaily.com)