Be cause they are cool. They don’t shine very bright. As long as they encapsulate all the matter and don’t have any accretion discs.
Otherwise you have to cool down everything for many million Kelvins.
Be cause they are cool. They don’t shine very bright. As long as they encapsulate all the matter and don’t have any accretion discs.
Otherwise you have to cool down everything for many million Kelvins.