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Contrast image formation in reflectors and refractors.
The tidal pull of the Sun largely cancels that of the Moon at the ________ phases.
When used in a single instrument to greatly enhance its resolution, the four separate
mirrors of the VLT act as a(n) ________.
Fusion in giant stars takes us all the way to iron before a Type II supernova occurs.
Why did it stop with helium in the far more energetic Big Bang?
Almost all of the complex molecules found in space are based on ________ atoms.
Name the layers of the Earth's atmosphere, going up from the surface.
Stars of the main sequence, like our own, are all converting ________ into helium.
Bright blue stars are typical of young ________ star clusters.
Emission nebulae occur only near stars that emit large amounts of ________
electromagnetic radiation.
While both Ptolemy and Copernicus assumed all orbits were ________, Kepler's first
law corrected this and made planetary motion predictable.
Why is Polaris not always the pole star, and when does it get another chance?
According to our HST deep surveys, ________ galaxies are less common now than in
the early universe.
Why are eclipsing binaries the rarest of the three types discussed?
Prior to decoupling, all matter was ________, with free electrons and nuclei.
Why is the bright yellow disk of the Sun, the photosphere, cooler than the areas both
above and below it?
The product of the wavelength times the frequency of a wave is its ________.
When an electron moves from a lower to a higher energy state, a photon is ________.
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