Q 01/05

How many planets are in our Solar System?

A) Seven

B) Eight

C) Nine

D) Ten

Answer · why

B) Eight

Pluto was counted as the ninth until 2006, when astronomers demoted it.

Q 02/05

What kind of object is the Sun?

A) A planet

B) A comet

C) A star

D) A moon

Answer · why

C) A star

It is a G-type main-sequence star, and it holds about 99.86 percent of all the mass in the Solar System.

Q 03/05

Which planet is closest to the Sun?

A) Venus

B) Mars

C) Mercury

D) Earth

Answer · why

C) Mercury

Oddly, it is not the hottest planet, because it has almost no atmosphere to trap heat.

Q 04/05

Which planet is the largest in the Solar System?

A) Jupiter

B) Neptune

C) Saturn

D) Uranus

Answer · why

A) Jupiter

You could fit about 1,321 Earths inside it.

Q 05/05

The Great Red Spot, the famous feature on the biggest planet, is what?

A) A giant storm

B) A volcano

C) A crater

D) A frozen lake

Answer · why

A) A giant storm

It has been observed since 1831 and is bigger than the whole Earth.