Section Five – Use the following words to fill in the blanks Black hole Massive White dwarf Supernova
Average Nebulae Super-giant Planetary Nebula
Neutron star

1. are clouds of dust and gas from which a star first forms. They are pulled together by gravity into a spinning disc. The center of the disc becomes a star while the rest can become a system of planets.

2. come from giant or massive stars. They grow to as much as three times the mass of our sun as they lose the nuclear fuel at their core. The outer layer of this red star expands as the core contracts.

3. Nebula can form either an star that is about the size of our Sun or a
star which can be over three times as big as our Sun! These stars stay in this period for most of their lives and they convert hydrogen to helium while generating lots of heat and light.

4. At the end of the life of a giant star, a is resulted when a red supergiant’s core collapses in on itself. The electrical forces at the center of the star overcome the gravitational pull and create a massive explosion that scatters the outer layers of the red supergiant.

5. The outer layers of a red giant keep expanding until they eventually drift off and form a .

6. Eventually the outer layers of an average star drift away and the star becomes a much smaller . It has now run out of nuclear fuel to burn off.

7. This star is very small and tremendously dense and marks the end of the
supergiant’s life cycle. It has a strong magnetic field, a very fast spin and is about 1.4 times the mass of the sun – it is called a .

8. If the star is very massive or big enough, a is formed, which is so dense that not even light can escape its gravitational pull!