Describe the evidence that the expansion of the universe is accelerating

Research each of the following three topics and submit your answers in a document in .docx (Word) format:
Which formed first: hydrogen nuclei or hydrogen atoms? Explain the sequence of events that led to each.
Astronomers have found that there is more helium in the universe than stars could have made in the 13.8 billion years that the universe has been in existence. How does the Big Bang scenario solve this problem?
Describe the evidence that the expansion of the universe is accelerating.

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