6.4 Galaxies Moving Apart

What process makes stars shine:

• light emission

• nuclear fusion

• burning fuels

• photosynthesis

Name this spectrum:

• continuous

• emission

• absorption

What effect causes sound to change pitch when approaching an object

• Doppler

• Dippler

• Dappler

• Duppler

When do galaxies appear to be more blue when moving towards Earth?

• compressed wavelengths

• stretched wavelengths

• hotter temperatures

• brighter stars

How do scientists know when stars are moving away from Earth:

• blueshift

• redshift

• emission spectrum

• Big Dipper moves

True or False

Stars have a lifecycle

• true

• false

RECAP

Large clouds of hydrogen gas are called:

• gas and dust

• nebulae

• supernova

• black hole

True or false

Small stars can become black holes:

• True

• False

When a star runs out of hydrogen, helium atoms become the fuel source. The star then:

• explodes

• dies

• grows

• spins

A supernova is:

• an explosion

• a big star

• the birth of a star

• a Jedi Light Cruiser