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How can prolonged observations of pulsars yield their approximate age?
The burst of X-rays from an X-ray burster is due to ________ of hydrogen on its
surface.
How did Ptolemy explain the retrograde motion of Venus?
To the outer edge of the Galaxy, the rotation curve finds objects moving ________ than
Kepler's Laws would lead us to expect.
What does it mean when we say the Earth's interior is differentiated?
How do most of the new solar systems we've discovered compare to our own?
One hemisphere of Enceladus may have the youngest surface of any of the jovian
moons, with volcanoes spewing "ash" and "lava flows" of ________.
Why do our best radar maps of Venus come from the Magellan space probe?
The speed of light (and radio waves) is 300,000 km/s. How far away is a spacecraft if
its radio signal takes 10 minutes to reach Earth?
Describe evidence for convection in the photosphere.
Our Sun will eventually become a red giant, then expel a ________ and collapse into a
white dwarf.
Compared to a hydrogen atom where the proton and electron both have spin in the same
direction, an atom where they spin in opposite directions will have ________ energy.
If the central engine for our Milky Way is a black hole of 3 million solar masses, then it
has an event horizon about ________ kilometers across.
Studies of a star's position made on the same calendar date over subsequent years yield
________.
Why was it surprising to find three planets orbiting a pulsar?
The ________ hypothesis is that the Earth does not occupy any special place in the
universe.
What is the astronomical significance of 26,000 years?
