Complete the following by choosing the correct word from the list below.
1. Stars are made up of huge clouds of dust and _______________ . ________________ pulls this cloud together
and compresses it. As the gas is compressed, the ___________________ increases.
2. Eventually, there is enough energy for atoms of ______________________ to collide so hard that they combine
to form ________________________ . This process is called nuclear ______________________ and produces a
lot of light and ________________ energy.
3. When a star has no hydrogen left, it will start fusing larger atoms and expanding. Average-sized stars eventually
collapse to form___________________ __________________ and ____________ ____________ . Massive
stars will form _________ ________________________ , which can then explode. This is called a
_________________________ .
4. The remaining material is very dense and will either form a __________________ star or a ____________
____________ . Black holes are the __________________ objects known in the universe. Even
________________ cannot escape from them.
black hole
heat
planetary nebulae
densest
helium
red supergiants
fusion
hydrogen
supernova
gas
light
temperature
gravity
neutron
white dwarfs
https://www.youtube.com/watch?v=PM9CQDlQI0A