star will experience a helium flash if   a. it is more massive than about 6 solar masses.   b. its core contains oxygen and helium.   c. its mass on the main sequence was less than 0.1 solar masses.   d. it is a supergiant.   e. its core is degenerate when helium ignites.

Q: In the shale unit, you find the following fossil:

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A: With the help of the collision, the unusual spin axis orientation of planets can be explained.

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