What is true of radio telescopes?
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The __________ Observatory is the x-ray equivalent of the Hu…
The __________ Observatory is the x-ray equivalent of the Hubble Space Telescope.
Kepler’s third law relates the square of the planet’s orbita…
Kepler’s third law relates the square of the planet’s orbital period in years to the cube of its average distance from the Sun in astronomical units.
__________ optics greatly reduces the effect of atmospheric…
__________ optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control.
When used in a single instrument to greatly enhance its reso…
When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the new VLT will be acting as an _________.
Radio telescopes are usually used only at night, but optical…
Radio telescopes are usually used only at night, but optical telescopes can be used day or night.
In Ptolemy’s geocentric model, retrograde motion is understo…
In Ptolemy’s geocentric model, retrograde motion is understood by the planet’s motion along its deferent, and along its epicycle.
Grazing incidence optics are critical to focusing __________…
Grazing incidence optics are critical to focusing __________ .
All modern large optical telescopes are refractors.
All modern large optical telescopes are refractors.
The mean distance between the Earth and the Sun is the _____…
The mean distance between the Earth and the Sun is the ___________ .