Sky Science
Explore Earth's place in the solar system.
5 questions, free, marked as you go with a worked explanation on every one.
What this covers
- the solar system
The questions
- What causes day and night on Earth?
- How long does it take Earth to orbit the Sun once?
- What causes the phases of the Moon?
- Which planet is closest to the Sun?
- What is the name for the imaginary line Earth spins around?