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Why Study Geysers?

Why Study Geysers?
eos.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from eos.org Daily Mail and Mail on Sunday newspapers.

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From candles to ladders: how astronomers measure very large distances in the universe

From candles to ladders: how astronomers measure very large distances in the universe
How do we know the universe is expanding? Your high school trigonometry is involved in the process.
Ever wondered how scientists know the distance to planets, stars, galaxies? Or even better, how to measure the universe’s size and its expansion? Well, they certainly don’t have a giant ruler, but they have other tools including “candles” and “ladders”.
The Parallax and 1 parsec = 3.26 light-years. Credits: astronomy.com
The easiest way to measure things far from Earth is called parallax and was discovered by ancient scientists not just the Greeks (who are usually responsible for discovering things), but several other ancient societies with knowledge of astronomy. ....

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10 Strange Facts About Atomic Clocks

The term atomic clock may conjure up scary, 1950s-horror movie mental images: A Doomsday device, constructed by a lab coat-wearing maniac in a mountain fortress, is ticking away the seconds before it wipes out our entire planet. In reality, though, atomic clocks are one of the more benign inventions to emerge from the explosion oops, maybe not the best word choice of knowledge about the workings of the atom and its parts. That knowledge came in the wake of the World War II Manhattan Project to develop the atomic bomb.
Unlike the bomb, though, atomic clocks don t split atoms and they don t blow up. Instead, they use oscillation that is, the change in the flow of electrical charge in between an atom s nucleus and its surrounding electrons, the same way an old-fashioned grandfather clock might use a pendulum. Because an atom s oscillation involves incredibly small units of time a cesium atom, for example, has a frequency of 9,192,631,770 cycles per second and is ext ....

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