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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