22.2 Stars Change Over Their Life Cycles

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We classify stars by their characteristics

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.

Sizes range from super giants to white dwarfs

Each stars color is determined my its

temperature

Star Temperatures and Color

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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.

Nebula: cloud of gas and dust in which stars may form

Sentence: Gravity pulls particles closer together in some regions of a nebula.

picture

Three stages of a lower-mass star:

Main sequence Giant Star White Dwarf

Neutron Stars Black Holes

• Emits radiation• Visible light• mass= 1-3 times that of the Sun

• NO radiation• invisible• mass= more than 3 times the Sun

• Extremely dense• Core left after supernova