Galaxies, Stars and the Solar System

Which phase of star formation is our sun in?

• 1. Formation

• 2. The Stable Phase

• 3. Red Giant

• 4. White Dwarf

A ______ is a collection of billions of stars, along with dust and gas, all held togther by gravitational forces.

How many planets are in our solar system?

• 5

• 9

• 8

• 6

Do you think it would be possible to live on Mars?

• Yes

• No

• Maybe?

Answer explanation

Maybe someday! As our sun progresses through its life cycle, it is continuously getting hotter and expanding the "Goldilocks Zone", so in the distant future Mars could become a habitable planet.

Gravity is a ______ that "pulls" objects towards its centre.

This planet type includes Neptune and Jupiter.

• Terrestrial

• Jovian

• Planetoid/dwarf planet

Ganymede, Io, Europa and Callisto are all moons belonging to what planet?

• Jupiter

• Mercury

• Earth

• Venus

Answer explanation

These moons are togther known as the "Galilean Moons" because they were all discovered by astronomer Galileo Galilei in 1610. Ganymede is the largest moon in our solar system. The second largest moon is Titan, which orbits Saturn.

What type of celestial body is the moon?

• Comet

• Asteroid

• Planetoid

• Satellite