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We believe binary stars to be the ________ likely to have an extraterrestrial civilization.
What do we mean by "life as we know it"?
Contrast the deaths of low- versus high-mass stars.
What is the study of cosmology?
The universe is dominated by dark ________.
Pulsars can range in mass from ________ to ________ solar masses.
What are some advantages of radio telescopes over optical telescopes?
An advantage a reflector has over a refractor is the elimination of ________.
Sirius has a parallax of 0.38", while Alpha Centauri's is 0.77." Alpha Centauri is about
________ as Sirius.
What is SETI? How is it being done?
Compared to the size of Mercury, Ganymede is ________.
Name the three principal divisions of the structure of the Earth's interior and the
chemical composition of each.
Why does Europa's surface promise life of some kind?
Describe our location in the Milky Way.
At spectral type B1, Spica is about three times hotter than the Sun, so every square cm.
of Spica must give off ________ times more energy than our Sun does.
The solar nebular theory has been supported by observation of dusty disks around the
________ of young, condensing stars.
Neutral hydrogen can be detected because its electron occasionally ________ its spin
and creates the 21-cm emission line for radio observers.
The solar neutrino problem was solved when it was discovered that neutrinos ________
during the time they take to reach the Earth.
What role did Percival Lowell play that led to the discovery and naming of Pluto?
Where is most of the water on Mars believed to be?
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