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Origins of Mysterious Interstellar Visitor 'Oumuamua May Finally Be Explained


Origins of Mysterious Interstellar Visitor Oumuamua May Finally Be Explained
AYLIN WOODWARD, BUSINESS INSIDER
17 MARCH 2021
The origin and identity of a massive space object that careened past Earth in 2017 have remained a mystery ever since.
The object, called Oumuamua – a Hawaiian name meaning scout or messenger – traveled on a trajectory that strongly suggested it came from another star system. That made it the first interstellar object ever detected.
 
But what was it? A few researchers, including Harvard University astronomer Avi Loeb, posited the object was an alien spacecraft. Others suggested it was an asteroid, or perhaps an interstellar comet.
Now, a pair of papers published in an American Geophysical Union journal offers another theory: that Oumuamua was shrapnel from a tiny planet in a different Solar System. ....

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When Volcanoes Go Metal


Date Time
When Volcanoes Go Metal
What would a volcano – and its lava flows – look like on a planetary body made primarily of metal? A pilot study from North Carolina State University offers insights into ferrovolcanism that could help scientists interpret landscape features on other worlds.
Volcanoes form when magma, which consists of the partially molten solids beneath a planet’s surface, erupts. On Earth, that magma is mostly molten rock, composed largely of silica. But not every planetary body is made of rock – some can be primarily icy or even metallic.
“Cryovolcanism is volcanic activity on icy worlds, and we’ve seen it happen on Saturn’s moon Enceladus,” says Arianna Soldati, assistant professor of marine, earth and atmospheric sciences at NC State and lead author of a paper describing the work. “But ferrovolcanism, volcanic activity on metallic worlds, hasn’t been observed yet.” ....

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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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