Stars/Life Cycle of Stars

The HR Diagram shows a relationship of a star's surface temperature and its

• color
• size
• apparent magnitude
• absolute magnitude

At 10,000 degrees Celsius, hydrogen begins to change into helium and energy is released in a process called

• supernova
• pulsar
• nuclear fusion
• nuclear fission

A small, hot star near the end of its life is a star called a

• white dwarf
• red dwarf
• supergiant
• protostar

As gravity pulls gas and dust into a sphere that becomes denser and hotter, and a sunlike star begins to form, it is called a(n)

• white dwarf
• red dwarf
• supergiant
• protostar

What type of star would be shown at the lower right end of the main sequence on the H-R diagram?

• white dwarf
• red dwarf
• supergiant
• protostar

a gigantic explosion that causes the death of a large star

• pulsar
• red giant 
• supernova
• black hole

a star in which the electrons and protons have become neutrons

• supernova
• neutron star
• black hole
• pulsar

a star that expands and cools once it runs out of hydrogen

• pulsar
• black hole
• red giant
• supernova

a spinning neutron star that emits rapid pulses of energy

• red giant 
• pulsar
• black hole
• supernova

a massive and dense object from which not even light can escape

• black hole
• supernova
• pulsar
• red giant