5 Things We Still Don't Know About the Solar System

What is the primary cause of the Sun's magnetic field?

• Solid iron core

• Moving charged particles in plasma

• Solar flares and sunspots

• Gravitational pull of planets

What is the main reason for Venus's extremely high temperature and runaway greenhouse effect?

• Its proximity to the Sun

• A high concentration of carbon dioxide in its atmosphere

• Frequent volcanic eruptions

• Its rapid rotation

What makes the methane storms on Uranus a mystery to scientists?

• They are much smaller than storms on other gas giants.

• They are driven by an unknown internal energy source, not the Sun.

• They only occur during specific seasons on Uranus.

• They are composed of unique gases not found elsewhere.

What is the "Kuiper cliff" that puzzles astronomers?

• A large, visible asteroid at the edge of the Kuiper Belt.

• A sudden drop-off in the number of objects in the Kuiper Belt.

• A region where objects in the Kuiper Belt become much larger.

• A boundary where the Kuiper Belt merges with the Oort Cloud.