The Milky Way and Andromeda galaxy are on a collision course: in about 3 billion years from now the two galaxies will collide. Then over a span of 1 billion years or so after a very complex gravitational dance, they will merge to form an giant elliptical galaxy. That's why the collision period is aproxi
Raining animals is a rare meteorological phenomenon in which flightless animals fall from the sky - that happens no matter the sky is clear (no strong winds, tornados or waterspouts) or it was raining. Such occurrences have been reported in many countries all over the globe in human hi
Emeralds are the green gem variety of the mineral beryl (Be3Al2(SiO3)6) and they are identical to other types of beryl except for their chromium and (sometimes) vanadium content: it is the chromium that gives emeralds their bright green color. The toughness (resistance to breaking) of
The word diamond comes from the ancient Greek word adamas and it means unbreakable. In mineralogy, diamond is an allotrope of carbon - the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. The only reason the diamond can
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