Topic 12 Test

What does the universe include?

• Only planets and stars

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

• Only galaxies and energy

• Only matter and empty space

How old is the universe estimated to be?

• 4.5 billion years

• 10 billion years

• 13.8 billion years

• 20 billion years

What event is believed to have started the universe?

• The Big Crunch

• The Big Bang

• The Big Freeze

• The Big Rip

What is happening to the universe over time?

• It is shrinking

• It is staying the same size

• It is constantly expanding

• It is disappearing

What is a light-year?

• The distance light travels in one year

• The time it takes for light to travel to the Sun

• The distance from Earth to the Moon

• The time it takes for light to travel to Mars

Approximately how many miles is a light-year?

• 5.88 trillion miles

• 3.5 billion miles

• 7.2 million miles

• 1.5 trillion miles

What do we use light-years to measure?

• Small distances on Earth

• Huge distances in space

• The speed of light

• The size of planets

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

• 4.2 light-years

• 2.5 light-years

• 10.1 light-years

• 1.3 light-years

What is a galaxy?

• A small group of planets

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

• A single star

• A type of planet

What is the name of our galaxy?

• Andromeda

• Milky Way

• Whirlpool

• Sombrero