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Star Life Cycle Worksheet
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Star Life Cycle Worksheet
A new star has been found in a nearby nebula. Use the evidence and your knowledge of stellar evolution to trace how stars form, change and eventually die. Remember: a star’s initial mass strongly influences its later stages.
1.A nebula is a vast cloud of gas and dust. Explain how gravity can turn material in a nebula into a protostar. Include what happens to the cloud as it contracts.
2.Put these stages in order for a Sun-like star, from earliest to latest: white dwarf, protostar, main sequence star, red giant, nebula.
3.During the main sequence stage, what process in a star’s core releases the energy that makes it shine?
- Hydrogen nuclei fuse to form helium.
- Helium nuclei split into hydrogen.
- The star burns oxygen using chemical reactions.
- The star reflects light from nearby planets.
4.A star’s starting mass shapes its life cycle. Match each description to the most likely remnant: white dwarf, neutron star or black hole.
- The exposed core left after a Sun-like star sheds its outer layers
- An extremely dense remnant that can form after a massive star explodes
- A remnant that can form if the collapsed core is sufficiently massive
- Neutron star
- Black hole
- White dwarf
5.True or false? The Sun is currently a main sequence star.
TrueFalse
6.True or false? Every star eventually becomes a black hole.
TrueFalse
7.In the high-mass star pathway, a red supergiant explodes as a supernova. Which stage follows the red supergiant, and what two possible remnants can be left behind?
8.Compare the endings of a Sun-like star and a high-mass star. Name one key event or stage in each pathway and explain how their outcomes differ.
9.A classmate says, “A star’s colour and brightness never change during its life.” Give one reason this claim is incorrect, using a change in a star’s life cycle as evidence.
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