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Describe the reasoning leading to the idea that the number of technological civilizations
in the galaxy is equal to the average lifetime of a technological civilization.
Why was deuterium so critical in the primordial nucleosynthesis?
In addition to the proper chemistry, it is ________ that determines the feasibility of life
on a given planet.
Describe the primary difference between the northern and southern hemispheres on
Mars.
Contrast the two types of radio galaxies in structure.
The ________ is a vast, spherical array of long period comet nuclei far beyond the orbit
of Neptune.
If the Moon rises exactly at sunset, what will its phase be? Why?
Why does SETI concentrate on the water hole?
The most energetic photons are ________.
The absolute magnitude scale is defined so that a difference of five magnitudes is a
luminosity difference of ________.
Which star shows the least motion in the northern sky over the course of an hour?
Contrast the destinations of the probes dispatched by the Galileo and Cassini missions.
Of all the planets, only ________ has surface features easily seen from Earth with
ground-based telescopes.
Why do we believe a black hole lies toward Sagittarius?
Stars of type ________ should last about ten billion years on the main sequence.
The water hole is important to SETI because it is a ________ part of the radio
spectrum.
Why is the Chandra X-ray Observatory critical to mapping intracluster gas?
State the relationship between frequency, photon energy, and wavelength.
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