Revision - Unit 8 - Astrophysics

A planetary system consists of a _____ and _____.

• Black hole and stars

• Star and planets

• Planets and moons

What is the name of our planetary system?

• Milky Way

• Sun

• Solar System

Between Mars and Jupiter there are millions of rocks forming a belt. These rocks are called ...

• meteors

• asteroids

• meteoroids

What is a galaxy?

• A huge collection of stars.

• A huge collection of planetary systems.

• A huge collection of black holes.

Each planetary system contains ...

• millions of stars

• one star

What is a black hole?

• An area of high density that allows nothing to escape it.

• An area so black that it cannot be seen.

• A massive explosion caused by the death of a star.

A(n) (1) orbits the sun.

A(n) (2) orbits a planet.

• 1) comet

  2) moon

• 1) moon

  2) comet

1) A large rock orbiting the sun. Smaller than a moon. Moons orbit planets.

2) Composed of ice and dust. Leaves a trail as it orbits the sun.

• 1) Asteroid

  2) Comet

• 1) Comet

  2) Asteroid

The planets and moon have fairly (1) orbits.

Comets have (2) orbits.

• 1) circular

  2) elliptical

• 1) elliptical

  2) circular

The speed of a comet is fastest when it is ... to/from the sun.

• closest

• furthest