One tropical year is about 365.24 days, corrected by leap years.
Question 8 / 10
Which dwarf planet was visited by NASA's New Horizons in 2015?
1
Ceres
2
Eris
3
Pluto
4
Haumea
New Horizons revealed Pluto's heart-shaped nitrogen plains.
Question 9 / 10
Which planet rotates on its side compared to its orbit?
1
Neptune
2
Uranus
3
Saturn
4
Mars
Uranus's axial tilt is about 98 degrees.
Question 10 / 10
What powers the Sun?
1
Coal combustion
2
Nuclear fusion
3
Fission reactors
4
Magnetic friction
Hydrogen fuses into helium in the solar core, releasing energy.
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Learn more: Solar System Planets Quiz
NASA Solar System Exploration publishes mission updates from Mars rovers, Jupiter's Juno probe, and outer-planet flybys.
Comparing terrestrial planets (Mercury–Mars) with gas giants highlights differences in atmosphere retention, magnetic fields, and moon formation. Dwarf planets remind us classification evolves with discovery.
