Unit 4.2 "Types of Galaxies "Explore 1

What is a group of billions of stars in space is called?

• Galaxy

• Nebula

• Solar System

• Universe

How Are Stars Distributed (spaced out) in Space?

• they are all in a line

• they exist in groups

• they are scattered evenly

• they are scattered unevenly

What do astronomers think that most, if not all, galaxies include?

• black holes

• Milky Ways

• Proxima Centauri

• Less than 2 thousand stars

What do black holes do for galaxies?

• help hold them the together

• pull the stars so hard that they explode

• keep them from colliding with other galaxies

Other than the sun, what is the closets star to Earth?

• Alpha Centauri

• Proxima Centauri

• North Star

• Polaris

Which unit is usually used to describe the distances of stars?

• Kilo Year

• Astronomical Units

• inches

• Light Year

How many stars are there in the universe?

• Hundred thousand

• Thousand Million

• 50 thousand Billion

• Billion Trillion

How many galaxies are there in the universe?

• 200 thousand

• 200 million

• 200 billion

• 200 trillion