Space Review

What is the universe?

• A collection of stars and planets

• Everything we can touch, feel, sense, measure, and detect

• Only the planets and stars

• Just the Milky Way Galaxy

What holds a galaxy together?

• Light

• Dust

• Gravity

• Time

How many planets are in our solar system?

• 5

• 8

• 10

• 12

What is a celestial body?

• Only stars

• Only planets

• An object in space like stars, planets, and moons

• Only galaxies

Approximately how many galaxies can we see from Earth?

• 1 billion

• 2 trillion

• 500 million

• 100 billion

What is the solar system?

• A collection of stars and galaxies

• A collection of eight planets and their moons in orbit around the Sun

• A group of asteroids and comets only

• A single planet with its moon

How long ago was the solar system formed?

• 3.5 billion years ago

• 4.6 billion years ago

• 5.5 billion years ago

• 6.6 billion years ago

What is an orbit?

• A straight path that one object takes

• A regular, repeating path that one object takes around another

• A random path that changes constantly

• A path that only planets take

Which planet takes 165 years to orbit the Sun once?

• Earth

• Mars

• Neptune

• Venus

What is the third planet from the Sun?

• Mars

• Earth

• Venus

• Jupiter