Stars and the HR Diagram

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

• color
• size
• apparent magnitude
• absolute magnitude

In ______________ ______________ stars, hydrogen atoms fuse into helium and energy is released in a process called fusion.

• supernova

• pulsar

• main sequence

• white dwarfs

A small, hot star resulting from an average mass star is called a ----- .

• white dwarf

• red dwarf

• supergiant

• protostar

The best description of a super giant star would be -

• hot and bright

• hot and dim

• average brightness and temp

• cool and bright

What color are the hottest stars?

• red
• yellow
• orange
• blue

________________ waves are the largest on the electromagnetic spectrum. For this reason they need ______________ satellite dishes to collect them.

• visible, fewer

• gamma, smaller

• radio, very large

• light, two

Our sun is one of billions of stars in the Milky Way galaxy; which is a _________________________ galaxy.

• elliptical

• spiral

• elongated

• irregular

Galaxies are collections of gas, dust, and billions of stars held together by _________________.

• fusion

• gravity

• the big bang

• black holes nearby

Energy is created in the core when two _____________ atoms join together to form a ______________ atom.

• helium, hydrogen
• carbon, hydrogen
• nitrogen, helium
• hydrogen, helium

What is the shape of our galaxy?

• spiral

• elliptical

• irregular