Transcript 22.2 Stars Change Over Their Life Cycles

22.2
Stars Change Over Their Life Cycles
• CLICK ME!!!
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
temperature
Star Temperatures and Color
HOT!
What is PARALLAX?
• The apparent shift in the
position of an object when
viewed from different
locations.
• 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
to move?
How do astronomers use parallax to measure
distance of stars?
To plot a star’s position from opposite sides of
Earth’s orbit.
picture
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:
Main sequence
Giant Star
White Dwarf
Neutron Stars
• Emits
radiation
• Visible light
• Extremely dense
• mass= 1-3
times that of the
Sun
• Core left after
supernova
Black Holes
• NO
radiation
• invisible
• mass= more
than 3 times the
Sun