The rest of the universe
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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

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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 foreverb) slow down and stay the same sizec) slow and start shrinking

  • No one knows what will happen!


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