How many planets?

• 10

• 9

• 5

• 8

How many planets in history? What are they?

• 9.Mercury, Theia, Uranus, Earth, Venus, Jupiter, Saturn, 5th Giant, Pluto

• 2. Earth, Mars

• 6. Earth, Mars, Venus, Jupiter, Saturn, Neptune

• 10.Mercury, Venus, Earth, Theia, Mars, Jupiter, Saturn, 5th giant, Uranus, Neptune.

Answer explanation

Well, there are 8 planets in present and 10 planets in history. This is because Theia impacts Earth and form the Moon. And Fifth giant was ejected (throw out) from the solar system due to Neptune's rapid migration long ago.

What type of Sun is?

• G2V

• G4V

• G1V

• G9V

How the Sun was formed?

• Supernova and nebula

• Antimatter

Answer explanation

A nebula means a gas that is high in density and very low temperature. The shockwave from near exploding star or two nebulas collide so the gravity is too strong that it break apart and form a proto star. Then proto star's core starts to heat up and form a T-Tauri Star. Then over time, these become stars.

What contains in the Sun?

• Oxygen, Nitrogen

• Hydrogen, Helium

• Carbon, Iron

• Methane

Answer explanation

Sun contains hydrogen and helium for nuclear fusion. Without it the Sun won't be a star!

2 Largest rocky planets are...

• Venus

• Mars

• Earth

• Mercury

2 windiest planets

• Earth, Mars

• Venus, Mercury

• Jupiter, Uranus

• Saturn, Neptune

What causes supernova?

• When a massive star runs out of fuel and expands into supergiant star. Then over time it explodes into supernova.

• Because of nuclear bombs.

How big the Milky Way? (In diameter)

• 800,00 light years

• 100,000 light years

• 1 million light years

• 1000 light years

__________is going to collide with Milky Way.

• Pinwheel Galaxy

• Segue 2

• Andromeda Galaxy

• Hoag's Object