Question

name: life of a star mini - assessment directions: answer the following questions. 1. stars are born from: a. black holes b. planetary nebulae c. stellar nebulae d. supernova 2. what process provides the energy for stars? a. fission b. fusion c. radioactive decay d. gravity 3. what do average stars become once they run out of hydrogen? a. red giants b. supergiants c. neutron stars d. black holes 4. how does the life of an average sized star end compared to the life of a massive star? 5. compare the type of elements formed in a red giant compared to a supergiant.

Explanation:

1. Stars form from clouds of gas and dust called stellar nebulae. Planetary nebulae are the remnants of stars, black holes are formed from massive - star collapses, and supernovae are the explosive deaths of stars.
2. The energy source for stars is nuclear fusion, where hydrogen atoms combine to form helium, releasing energy. Fission is the splitting of atoms, radioactive decay is the breakdown of unstable nuclei, and gravity is a force, not an energy - producing process for stars.
3. Once average stars run out of hydrogen, they expand into red giants. Supergiants are very massive stars, neutron stars and black holes are formed from the collapse of massive stars.
4. An average - sized star ends as a white dwarf after passing through the red - giant phase. A massive star ends in a supernova explosion and can form a neutron star or a black hole.
5. In a red giant, hydrogen is fused into helium and some helium may be fused into carbon and oxygen. In a supergiant, heavier elements up to iron can be formed through a series of nuclear - fusion reactions.

Answer:

1. c. Stellar nebulae
2. b. Fusion
3. a. Red Giants
4. An average - sized star ends as a white dwarf after passing through the red - giant phase. A massive star ends in a supernova explosion and can form a neutron star or a black hole.
5. In a red giant, hydrogen is fused into helium and some helium may be fused into carbon and oxygen. In a supergiant, heavier elements up to iron can be formed through a series of nuclear - fusion reactions.