What Force Is Responsible for the Collapse of an Interstellar

Q2: Why are interstellar absorption lines so narrow

Q4: How does a gas cloud become hot

Q5: Why does the proton-proton chain need high

Q6: Why is there a lower end to

Q7: Which of the following is NOT evidence

Q8: What evidence can be used to show

Q9: What can initiate the free-fall contraction of

Q10: Explain what keeps the nuclear reactions in

Q11: Why are protostars difficult to observe?<br>A)The protostar

Q83: What is the difference between the proton-proton