Question

multiple choice 1 point
the process in which stars make elements from hydrogen is known as what?

fission
fusion
proton pump
neutron synthesis

multiple choice 2 points
select the best 3 words to finish this sentence. all you need to make a star is ___, _ and ___.

uranium, dark matter, electrons
hydrogen, gravity, time
electrons, gluon plasma, time
gravity, planets, solar systems

Explanation:

For the first question:

• Fusion: In stars, hydrogen nuclei combine (fusion) under high - temperature and pressure to form heavier elements.
• Fission is the splitting of a heavy nucleus (not relevant for stars making elements from hydrogen).
• Proton pump is related to cellular processes (not stellar element formation).
• Neutron synthesis is part of some nucleosynthesis but not the main process for forming elements from hydrogen in stars.

For the second question:

• A star needs hydrogen (fuel for fusion), gravity (to hold it together and create high - pressure conditions for fusion), and time (for the fusion processes to occur over long periods).
• Uranium is a heavy element not involved in the basic star - forming and early - stage fusion processes.
• Dark matter has a role in galaxy - scale structure but not in the immediate star - formation requirements at the level of basic stellar physics for the question.
• Electrons are part of atoms but not the key components emphasized in the simple "ingredients" for a star (hydrogen, gravity, time).
• Gluon plasma is a state of matter at extremely high energies (not relevant for star - formation in the context of this question).
• Planets and solar systems are formed after a star has already been in existence for some time.

Answer:

1. Fusion
2. Hydrogen, gravity, time