Chapter 15 Stars, Galaxies, & the Universe

Vocabulary to Know

• Black hole• Nuclear fusion• Parallax• Pulsar• Quasar• Supernova• Spectrum

Key Concepts

• Color of a star & temperature

– Red stars are the ____________

– Blue stars are the ___________

• A spectroscope give astronomers info about a stars ______________ & _____________

Key Concepts

What do the black lines indicate?

• Absolute Magnitude vs Apparent Magnitude

– Apparent magnitude is bright a star as viewed

from Earth

– Absolute magnitude is seeing how bright each star

would be if all stars were 32.6 light years away

from Earth.

Key Concepts

Key Concepts – Life Cycle of a Star

Key Concepts:

HR Diagram

Hint:

TEST QUESTION

• Time …. Approximately 14 billion years ago• All matter was compressed• Pressure caused an explosion• Extreme heat to cooling within seconds• Cosmic radiation– Noise left over from Big Bang

Key Concepts – Big Bang Theory