A star’s lifetime, luminosity, and eventual fate is determined by

What would happen to the Earth if the sun suddenly became a black hole? (ignore the temperature change)

Extremely high mass (20-30 solar masses) stars have large cores. When they die they will most likely end up as a

The least dense planet in the solar system is

There is star formation in Elliptical Galaxies.

List the Spectral types in order of temperature from Hottest to Coolest.

List the Spectral types in order of temperature from Hottest to Coolest.

What percentage of the overall density of the universe is made up of dark matter combined with regular matter and energy?

What was the age of the universe when it became transparent and photons could travel without running into anything?

During star formation, the dense parts of the molecular cloud that collect material while contracting and heating up are known as