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16.3 How are Stars Grouped Together?

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on 1 May 2015

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Transcript of 16.3 How are Stars Grouped Together?

Constellations
Constellation: a group of stars that forms a pattern. The sky Is divided into 88 constellations.
Dividing the sky into sections makes it easier to study. A constellation is like a star's address.
Stars that appear close in the sky may be light years away.
People in different parts of the word see different constellations.
Stars on the Move
Stars "move" in logical and predictable ways.
As the earth rotates, stars appear to move across the sky.
As the earth orbits the sun, different constellations are visible at different times of the year.
The Universe is Moving
Nothing in the universe stands still.
After thousands of years, the patterns of stars in the sky will appear different.
The universe is expanding, which means every year things are getting farther and farther apart.
Galaxies
A
galaxy
is a huge system of stars, dust, and gas held together by gravity.
There are
billions
of galaxies in the universe.
3/4 of galaxies are
spiral
, they look like pinwheels.
Elliptical
galaxies look round or oval.
Irregular
galaxies have no real shape.
16.3 How are Stars Grouped Together?
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