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Optically mapping the Milky Way is made very difficult because of ________ in the
disk.
If Sirius transits my local meridian tonight at 6:43 PM, when will it transit tomorrow?
Name the four forces of the universe from weakest to strongest.
The largest volcano in the solar system, ________, is found on Mars.
The curved, yellow ________ tail lags behind the blue tail as the comet rounds the Sun.
Why do new stars generally form in close proximity?
Most of our knowledge of stellar evolution comes from studies of ________.
Pluto was named after the Roman god of the dark underworld, and also for ________.
In age, the surface of Venus is much ________ than even the lunar mare.
Why was Copernicus' model much simpler than Ptolemy's?
Why were the mass and density of Pluto unknown until Charon was found?
Variable stars are ones whose ________ changes over time.
The Great ________ Spot of Neptune was striking in 1989, but gone by 1995.
What is the importance of 1.4 solar masses in stellar evolution?
The COBE data, combined with computer simulations, strongly supported the
________ Epoch, showing how ripples in the background radiation could collapse into
galaxies over time.
