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Generally, the densest parts of the interstellar medium are the ________.
Weather always occurs in the lowest layer of the atmosphere, the ________.
How does a star's luminosity relate to its radius and surface temperature?
Describe the distance and composition of the Alpha Centauri system.
Star ________ have been vital in understanding stellar evolution, finding distances, and
mapping the structure of our Galaxy.
Of the main sequence stars, those of type ________ have the longest main-sequence life
spans.
Without the strong nuclear force, the only element in the universe would be ________.
Explain.
The strange object ________ is believed to be the black hole in the center of our
Galaxy.
Other than its atmosphere, name two properties of Venus that are unique among the
terrestrial planets.
The radio lobes of active galaxies can span ________ of light years.
Contrast the compositions and heights of the clouds of Earth and Venus.
Why do we know much more about the surface of Mars than that of Venus?
Discuss the roles that ammonia, hydrogen sulfide, and methane play in the appearances
of the jovian planets.
Nothing in the universe can travel faster than ________.
Why are there no black dwarfs yet, but in the future they may make up the majority of
normal matter in the universe?
Describe how Eratosthenes measured the circumference of our planet.
How would the radio Earth appear to extraterrestrials?
The range of wavelengths for the "water hole" is ________ cm.
What advantage do radio astronomers have over optical ones in mapping the entire
Milky Way?
What do all the stars in the Orion Association have in common?
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