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Home Q & A Board Science-Related Homework Help Physics Astronomy
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studyperfect studyperfect
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6 years ago
Which two energy sources can help a star maintain its internal thermal pressure?
 
  A) nuclear fusion and gravitational contraction
  B) nuclear fission and gravitational contraction
  C) nuclear fusion and nuclear fission
  D) chemical reactions and gravitational contraction
  E) nuclear fusion and chemical reactions

Question 2

While the orbits of planets are nearly circular, the eccentricities of the orbits of ________ are near one.
 
  Fill in the blank(s) with correct word

Question 3

Briefly explain how an impact event 65 million years ago could have caused the extinction of the dinosaurs.
 
  What will be an ideal response?
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Michael876Michael876
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6 years ago
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studyperfect Author
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6 years ago
Smart ... Thanks!
GeorgeNeist
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Yesterday
This helped my grade so much Perfect
Lawson1981
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2 hours ago
This site is awesome
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