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10 questions
How many planets orbit the Sun in our Solar System?
7
8
9
10
Select the correct order of the planets, starting with the closest to the Sun.
Mercury, Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune
Mercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Which of these orbit planets?
dwarf planets
natural satellites
artificial satellites
comets
asteroids
What is the force that keeps planets in orbit around the Sun?
The planets move around the Sun in ________ orbits.
Circular
Elliptical
Which of these materials are comets made from?
rock
dust
metal
ice
The closer a planet is to a star, the _____ its orbital speed.
faster
slower
Two planets are orbiting a star.
Planet A has an orbital speed of 30 km/s.
Planet B has an orbital speed of 42 km/s.
Which planet has the smallest orbital radius?
Planet A
Planet B
An artificial satellite is a man-made object that orbits a planet.
True
False
In a circular orbit, the ________ of a planet is constantly changing.
speed
velocity
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