Astronomy

question1:
In 2-3 paragraphs, answer the following prompt thoroughly, clearly, and in detail:
The leftover ‘cores’ of stars feature some of the most extreme physical conditions in the universe. Describe thoroughly, clearly, and in as much detail as you can the radius, mass, surface gravity, and composition of the leftover cores of low-mass stars and high-mass stars once fusion has completely stopped within them (in other words, after the planetary nebula or supernova phase). If there is no fusion, what forces support each of these objects against the crushing force of their own self-gravity? (HINT: Be sure to consider all the possibilities! With examples and details!)

question2:
Consider the percentage of all supernova explosions that are high-mass star supernovae, and not white dwarf supernovae. Would you expect this percentage to have been higher, lower, or about the same 5 billion years ago when our Solar System formed? Why? (HINT: Think about both kinds of supernova, and how many of each type might have been going on in the past!)

I attached two document that you can help you answer these two questions.

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