Nature does not produce a white dwarf greater than 1.44 times the mass of the Sun

The only way to determine decisively whether black holes exist or not was to observe one in nature

Ancient and medieval astronomers were well aware that stars in the night sky came in multiple colors

Hubble was also able to measure the distance to Andromeda which he determined to be about 6 million lightyears

Every single star in the night sky is a flaming ball of hydrogen gas, millions of times more massive than the Earth