Two stars have the same absolute magnitude, and have a spectrum indicating they are main sequence stars.

The outermost layer of the Sun’s atmosphere is the 

In order to create an emission nebular, a star must emit large amounts of _____ radiation.

The luminosity of the Sun measures

The most common way of creating a black hole is 

In our galaxy, where would you expect to find very old stars spread far apart, and almost no interstellar gas and dust?

You would find a supermassive black hole in the

Identify the structural tubes that carries urine from the kidneys to the bladder.

The valve at the entrance to the stomach is the

The liver produces