How is energy lost from the photosphere of a protostar replaced

Protostars are best observed in the

Since a dust cloud between a star and an observer reflects (blank) light more effectively than (blank) light, the dust cloud causes the star to appear (blank) than its true color

The minimum possible mass for a main sequence star is about (blank) : an object below this mass is called a (blank)

A 1 M of sun star leaves the main sequence when

In a star becoming a red giant, gravity causes the core to (blank). At the same time, the outer region of the star (blank)

As a 1 M of sun star enters the horizontal branch phase, the core is composed of (blank) and (blank) undergo nuclear fusion

A classic planetary nebula appears as a bright ring on the sky. The true shape of such an object in space is a

A red giant star has a luminosity that is (blank) than that of the sun and a surface temperature that is (blank) that of the sun

The main sequence in the H-R diagram extends from (blank) stars to (blank) stars

What keeps a white dwarf from contracting further

The main sequence turnoff is the location in the H-R diagram of stars just becoming (blank). The older the cluster the (blank) the mass of the turnoff stars

Just prior to the supernova explosion the core of a massive star (m > 8 m of sun) is composed of (blank) and (blank) undergo nuclear fusion

The size of a neutron star is closest to the size of

A pulse of (blank) is emitted from the collapsing core of a massive star, during a supernova

Where are elements heavier than iron produced

Which of the following is NOT correct for supernova 1987a

Which describes the gas in a supernova remnant like Cas A