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Stephen Hawking May Help Prove Planet Nine is a Black Hole


Stephen Hawking has been gone for three years this month, but he lives on in reruns of “The Big Bang Theory,” “The Simpsons” and “Futurama,” as well as in physics, cosmology and the many other fields his genius influenced. Now he has a chance to be famous in the far reaches of the solar system in a new(ish) but unproven theory that the mysterious Planet Nine exists, but not as a planet. Searching for Hawking radiation, some scientists think they can prove it’s actually a black hole using a high-speed spacecraft flyby. Could proving this convince the cast to reunite for one more “The Big Bang Theory” and toast Stephen Hawking? ....

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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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Sharpless 168 + 169 - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes

Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing, telescopes, NASA, Hubble, space missions, stargazing, and more ....

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M 67 - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes

Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing, telescopes, NASA, Hubble, space missions, stargazing, and more ....

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