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According to current understanding, the two most abundant elements in the universe were made __________.

in the Big Bang

elements with even atomic numbers tend to be more abundant than neighboring elements with odd atomic numbers. What nuclear process explains why this is the case?

Starting from carbon (atomic number is 6), the most common nuclear reactions involve the fusion of an additional helium nucleus.

Which of the following differences, if it had actually been observed, would have forced us to rethink our entire picture of stellar evolution?

The abundance of elements heavier than uranium turned out to be greater than the abundance of carbon.

Provided following are various stages during the life of a high-mass star. Rank the stages based on when they occur, from first to last.

1. contracting cloud of gas
3. main sequence O star
4. red supergiant
5. supernova
6.neutron star

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