Well, here's a close-up image of the Andromeda Galaxy - each dot is a star This image was taken by the Hubble Space Telescope, the largest and sharpest image ever taken from the Andromeda Galaxy. The full image contains 1.5...
Auroras get their colors from specific elements in Earth's upper atmosphere. Green auroras, for instance, come from atomic oxygen; blue is associated with molecular nitrogen. How are the colors of the aurora created? The sun radiates all visible colors, which...
The man grinds his teeth twice. The first gritted milk teeth begin to fall out after about six years. Teeth can be seen in the mouth until the age of ten or twelve. These are then replaced by permanent teeth....
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