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Why does the core of a main-sequence star have to be hotter to burn helium into carbon than hydrogen into helium?
Q5: Eclipsing binary systems:<br>A) orbit in the plane
Q7: What is the difference between a grand
Q7: How is the distance to a star
Q8: Our current ideas on galaxy formation suggest
Q15: Examine the figure below.Describe why the distance
Q23: If you found a galaxy with a
Q38: The first atmospheres of the terrestrial planets
Q40: The Drake equation is used to predict
Q44: Which term refers to the benefits of
Q49: Gravitational lensing occurs when _ distorts the