Topic 12 Test

Front

What does the universe include?

Back

All planets, stars, galaxies, matter, energy, and even empty space

Front

How old is the universe estimated to be?

Back

13.8 billion years

Front

What event is believed to have started the universe? Options: The Big Crunch, The Big Bang, The Big Freeze, The Big Rip

Back

The Big Bang

Front

What is happening to the universe over time?

Back

It is constantly expanding.

Front

What is a light-year?

Back

The distance light travels in one year

Front

Approximately how many miles is a light-year?

Back

5.88 trillion miles

Front

What do we use light-years to measure?

Back

Huge distances in space

Front

How far is the nearest star to Earth (besides the Sun)?

Back

4.2 light-years

Front

What is a galaxy?

Back

A huge collection of stars, gas, and dust held together by gravity.

Front

What is the name of our galaxy?

Back

Milky Way