Fill the gaps:
Almost all of the ........ are moving way from each other with the ....... galaxies moving fastest.

With the help of what new invention could Galileo observe the four moons orbiting Jupiter?

What did this confirm?

What and whose idea did this new observation support?

Why did the Roman Catholic Church not support Galileo's model?

In the 17th century, Newton was working on hi theory of universal gravitation. What did this theory suggest?

Why do we believe that gravitational collapse is prevented today?

What is red shift?

When scientists look at light from the Sun, what is there?

When is this same pattern observed?

What can scientists use information from red shift to work out?

What is a nebula?

Nebula clouds are pulled together by gravity and, as the spinning ball of gas starts to get hot, it glows. What is this known as?

Why can it not be seen?

What force causes the star to become smaller, hotter and brighter?

What then happens to the star after millions of years?

Fill the gaps:
As ........ nuclei join together to form helium ......, energy is released and the star continues to shine while there is enough .........

Why do small stars shine for longer than large stars?

At the end of a medium-sized star's life what does it become?

What happens for a medium-sized star to became a red giant and then when it comes to the end of its life?

What happens to large stars when it comes to the end of its life?

Describe the features of a black hole.