Formation of the Moon & Nebulae

The collision theory suggests that an object called Theia collided with Earth. Which of these planets is closest in size to Theia?

• Earth

• Moon

• Venus

• Mars

The collision theory for the formation of the Moon describes an object the same size as Mars. What was this object?

• an asteroid

• a newly formed star

• a newly formed planet

• a comet from outside the Solar System

The collision theory is a theory of how the Moon was formed. It refers to a collision that happened relatively soon after the formation of the ...?

• universe

• Solar System

• Milky Way

• Moon

Which evidence supports the collision theory?

• The Moon has a small iron core, similar to the Earth

• Venus has no moon

• The Moon is Earth's only permanent natural satellite

• The surface of the Earth does not appear to ever have been molten

Which evidence contradicts the collision theory?

• Samples of rock from the Moon show that its surface was once molten

• Similar collisions causing rings of rock and dust outside the Solar System

• The collision theory fits with the theory of how the Solar System was formed

• None of them

Nebulae are clouds of ... ?

• Phineas and Ferb

• dust and gas

• Bonnie and Clyde

• atoms and molecules

Nebulae are primarily composed of what element?

• Hydrogen

• Helium

• Iron

• Oxygen

Which of these statements is correct?

• all nebulae act as stellar nurseries

• only some nebulae act as stellar nurseries

• no nebulae ever act as stellar nurseries

• most nebulae are smaller than the Sun

"Nebula" is Latin for ___

• cloud

• gas

• glow

• colour

Dust clouds that reflect the light of nearby bright massive stars are called ___

• emission nebulae

• mirror nebulae

• reflection nebulae

• gas nebulae