Solar System Explorer Answer Key
Explore the planets, moons, and other objects in our solar system and compare their properties.
Looking for Solar System Explorer answers? This complete answer key provides verified solutions for all student exploration activities and assessment questions in the ExploreLearning Solar System Explorer Gizmo.
✅ 100% Free • Step-by-step explanations • Perfect for homework help • Covers all activities • Updated for 2026
Prior Knowledge Questions
Q1.How many planets are in our solar system?
There are 8 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Q2.What is the difference between inner and outer planets?
Inner planets (Mercury, Venus, Earth, Mars) are rocky and small; outer planets (Jupiter, Saturn, Uranus, Neptune) are gas giants and much larger.
Q3.What keeps planets in orbit around the Sun?
Gravity from the Sun keeps planets in orbit; the planets' forward motion balances the Sun's gravitational pull.
Activity A – Planetary Comparisons
Q4.Which planet has the most moons?
Q5.Why is Pluto no longer classified as a planet?
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