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Which planet is closest to the sun?
Mercury
Name the order of the planets starting from the sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
What does tricky mean?
difficult
What is required for a planet to have life?
Liquid water
Why does Mars have weak gravity?
It's small size
What can we use to look into space?
A telescope
What is NASA?
The National Aeronautics and Space Administration - American government space agency
What do we call the genre of films about space?
sci-fi, science fiction
What is the name of the people who work in space?
Astronaut
Which is the biggest planet?
Neptune
Which word means go around something in a circle?
orbit
What is the name of the force which pull things down to earth?
Gravity
