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The Rest of the Universe. Stars and Galaxies. Stars. constellations- an imaginary picture made by groups of stars; example: The Big Dipper The color of the star indicates the temperature. Blue is the hottest, red is the coolest.

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the rest of the universe

The Rest of the Universe

Stars and Galaxies

stars
Stars
  • constellations- an imaginary picture made by groups of stars; example: The Big Dipper
  • The color of the star indicates the temperature. Blue is the hottest, red is the coolest.
  • apparent magnitude- how bright a star looks from Earth. Things far away appear to look dim.
a star s life
A Star’s Life

1. Birth- created from cloud of gas and dust

2. Adulthood- uses hydrogen and helium for nuclear fusion fuel

3. Old age- enlarges into a red giant or supergiant

4.

or

4. Explodes in a supernova!

4. Uses up its fuel and becomes a dwarf star

(white, then brown then black when doesn’t give off any more light)

5. Neutron star

(2-3 times mass of our sun)

5. Black hole

(>7 times mass of our sun)

or

galaxies
Galaxies
  • galaxy- a group of stars, gas and dust held by gravity
  • Three types: spiral (our Milky Way), elliptical and irregular
  • Stars revolve around the center of their galaxy.
  • Most galaxies have a black hole in the center!
  • Light-year= the distance light travels in one year
  • Nothing can go faster than the speed of light.
what s next
What’s Next
  • The universe is expanding, constantly getting bigger, so things are getting further apart.
  • It could a) keep expanding forever b) slow down and stay the same size c) slow and start shrinking
  • No one knows what will happen!
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