Download Life Cycle of Star EDpuzzle worksheet

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Life Cycle of a Star
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1. What force is causing the nebula to get denser and hotter?
2. What happens during nuclear fusion?
a. 4 atoms of H fuse into 1 atom of He.
b. 4 atoms of He fuse into 1 atom of H.
3. What determines what happens to a star for the rest of its life?
a. How hot it is.
b. How bright it is.
c. How far away from Earth it is.
d. How massive it is.
4. A star is in a delicate balance of what two forces?
a. Inward pull of gravity and outward push of pressure from fusion.
b. Inward pull of heat from fusion and outward push of gravity.
5. What happens to the core of the star when it begins to run out of Hydrogen?
a. Begins to expand
b. Begins to collapse
6. What happens to a star once Helium begins to fuse heavier elements creating more energy?
a. The star expands
b. The star collapses
7. Once the Sun expands out as far as Earth, it will become what kind of star?
a. Red Giant
b. White Dwarf
8. What happens to the outer layer of the Red Giant as it expands?
a. It will drift off into space and become a Solar Nebula
b. It will explode and become a Solar Nebula
9. The remaining core of the Sun will be called a White Dwarf. What is a White Dwarf like?
a. It is dense and cool with fusion still occurring.
b. It is dense and hot but no fusion is occurring.
10. Some stars are able to fuse heavier and heavier elements and expand 1000 times bigger than our
Sun. Why is this?
a. Because they are much cooler than our Sun.
b. Because they are much more massive than our Sun.
11. What is the heaviest element that can form in fusion before fusion stops?
a. Lead (Pb)
b. Iron (Fe)
12. What triggers the Super Nova explosion of a massive star?
a. The collapse of the core.
b. The fusion of heavier elements past iron (Fe).
13. What do you call the left-over core from a Super Nova?
a. Black hole
b. Neutron star
14. Which stars turn into black holes?
a. All stars more massive than our Sun.
b. The most massive stars of all.
15. Where do we come from?