Space

What provides the force needed to keep a satellite in its orbit?

• Friction
• Gravity
• Tension

Complete the following sentence. The fact that light from a distant galaxy seems to move towards the red end of the spectrum gives scientists evidence that.

• Galaxies are shrinking
• Galaxies are changing color
• The universe is expanding

Energy is released in stars by the process of nuclear ___________.

• Decay
• Fission
• Fusion

The discovery of cosmic microwave background radiation was important because it.....

• proved the big bang theory to be correct
• provided more evidence to support the big bang theory
• proved the universe will continue to expand forever

When a satellite is in geostationary orbit it........

• Orbits over the poles of the earth
• orbits above one position over the earth
• orbts around the earth in a highly elliptical orbit

All stars go through a lifecycle. The star Mira will go through a supernovva stage in its lifecycle but the sun will not. How is the star Mira different to the sun?

• Mira is much older than the sun
• Mira is much smaller than the sun
• Mira is much bigger than the sun

Six hundred years ago people believed in the geocentric model of the solar system. What piece of evidence lead to this being revised to the heliocentric model?

• The couldn't explain the speed the planets were orbting the sun
• They couldn't explain why some of the planets seemed to move backwards in the night sky
• They couldn't explain why you couldn't see some of the planets at times

Astronomers claim that there are about 300 billion stars in the Milky Way. Describe how stars are formed.