Astronomy
Course Description
Definition of astronomy: Astronomy is the study of the sun, moon, stars, planets, comets, gas, galaxies, gas, dust and other non-Earthly bodies and phenomena.
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An image of the sun taken with the Extreme Ultraviolet Imager aboard STEREO-A, which collects images in several wavelengths of light that are invisible to the human eye. This image shows the sun in wavelengths of 195 angstroms, which are typically colorized in green.
NASA/STEREO