The Earth in space

Which of the following are sources of light in space?

Select TWO answers.

• Jupiter

• Saturn

• The Sun

• Stars

• Asteroids

Why can we see a comet even though it is not a source of light? This is because

• It reflects sunlight

• It produces its own light

• It is opaque

The Sun appears to move across the sky because of

We have day and night because of

It is warmer during summer because

• the Earth's axis is tilted away from the Sun in that hemisphere

• the Earth's axis is tilted towards the Sun in that hemisphere

• the Earth's axis is not tilted

The Earth completes one rotation about its axis every ___________. This period is known as a day.

• 28 days

• 24 hours

• 365.25 days

One day consists of both daytime, when the surface of the Earth receives light from the Sun, and nighttime, when it doesn't. Daytime and nighttime are caused by the ___________ of the Earth about its axis.

(One word answer only)

The further away from the Sun a planet is, the _________ the length of its year.

• Longer

• Shorter

Stars appear to move during the night because of the Earth's

• Rotation on its axis

• Orbit around the sun

The pattern of stars during summer night sky is different from that during winter night sky from the same location because of

• the orbit of the Earth around the Sun

• the rotation of the Earth on its axis

• the tilt of the Earth's axis