22.2 Stars Change Over Their Life Cycles
Transcript 22.2 Stars Change Over Their Life Cycles
Stars Change Over Their Life Cycles
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All stars are balls of glowing
gas that produce or have
produced energy by fusion
The amount of light and its
distance determine how bright a
star appears from Earth.
We classify stars by their characteristics
Sizes range from super
giants to white dwarfs
Each stars color is
determined my its
Star Temperatures and Color
What is PARALLAX?
• The apparent shift in the
position of an object when
viewed from different
• Try this! Close one eye at a time
and focus on a single object. Blink
back and forth quickly. What
happens!? Does the object appear
How do astronomers use parallax to measure
distance of stars?
To plot a star’s position from opposite sides of
Sentence: Gravity pulls particles closer
together in some regions of a nebula.
Nebula: cloud of gas and dust in which stars may form
Three stages of a lower-mass star:
• Visible light
• Extremely dense
• mass= 1-3
times that of the
• Core left after
• mass= more
than 3 times the