Fusion depends upon the ________ nuclear force getting the protons to stick together.
How can the age of a star cluster be found from its H-R diagram?
The vast flood deposits prove Mars once had much running water. What happened to it?
A possible evolutionary sequence is quasar to ________ to normal spiral galaxy.
________ is responsible for heating the Earth’s interior today.
Quasars are far more luminous than Type I supernovae; why not use them to calibrate
Ho and the age of the universe?
How did Herschel try to map our Galaxy 200 years ago, and why did he fail?
Compare hours of right ascension to time zones on the Earth.
How did Ptolemy explain the retrograde motion of Mars?
A rocky body between the orbits of Mars and Jupiter is a(n) ________.
The ________ variables in the closer globular clusters were used by Harlow Shapley to
find their distances.
Name three ways that Saturn’s ring system is unique.
The age of the solar system is determined with ________ dating.
Contrast S and P waves in terms of speed and transmission through the interior.
What do sunspots tell us about the Sun’s rotation rate?
The Copernican Principle notes that we are nothing special, not at the center of
anything. Apply it to the work of Harlow Shapley.
A protostar of one-half solar mass would reach the main sequence in ________ time
than it took our own Sun.