Study Guide C2 L2&3 Solar System, Stars, Galaxies & the Universe

Front

What are stars primarily composed of?

Back

Hydrogen

Front

What is the natural satellite of Earth called?

Back

Moon

Front

What do we call a streak of light produced by a meteoroid as it passes through the Earth's atmosphere?

Back

Meteor

Front

What is a small rocky object that orbits the Sun called?

Back

Asteroid

Front

What theory states that the universe began from one point and has been expanding and cooling ever since?

Back

Big Bang

Front

What is the term for a large system of stars, gas, and dust held together by gravity?

Back

Galaxy

Front

What is the name of our galaxy?

Back

Milky Way

Front

What is the closest star to Earth?

Back

Proxima Centauri

Front

What do we call a celestial body that orbits a planet?

Back

Moon

Front

What is the difference between a meteoroid, meteor, and meteorite?

Back

A meteoroid is a small rock in space, a meteor is the streak of light it creates in the atmosphere, and a meteorite is what remains when it hits the ground.