Share Ch 2 Lesson 3 Star, Galaxies and the Universe
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The Local Group is a (cluster or supercluster) made up of 30 galaxies.
cluster
Earth is located (near the center or in one of the arms) of the Milky Way galaxy.
in one of the arms
Irregular galaxies are (shaped like footballs or oddly shaped)
oddly shaped
Our Sun is (an ordinary color or very massive) compared to most other stars
very massive
Give 3 characteristics of stars.
sphere shaped, very hot, made up of burning gases
What is a supercluster?
A supercluster is the Local Group + other stars, gases, and dust.
What is the name of the galaxy we are located in?
The Milky Way Galaxy
Explain the Big Bang Theory.
The universe formed from a single point and is still expanding.
The distance from Earth to the Sun is called
One astronomical unit
The distance light travels in one year is called
light year
How is the distance between stars measured?
in light years
Define galaxy.
A galaxy is a huge collection of stars, gases and dust that is classified by shape.
True or False: Elliptical galaxies contain older, redder stars.
True
True or False: The Sun is a yellow star.
True
True or False: Irregular galaxies have many young stars.
True
True or false: Spiral shaped galaxies contain young, blue stars in their central bulges.
False: Older, redder stars are in their central bulge; young stars are in their arms.
