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The hottest known exoplanet is melting molecules in its atmosphere

Thursday, January 30th 2020 11:44 PM

  The hottest known exoplanet is back in the news, answering some questions about ultra-hot planets, while also raising some new ones. The planet, KELT-9b, was first announced in 2017. It’s roughly three times the mass of Jupiter, orbits its star every day and a half, and is a whopping 7,800 degrees Fahrenheit (4,300 Celsius). Just for the record, that’s hotter than some...

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Scientists find meteorite pieces older than the solar system

Monday, January 13th 2020 11:09 PM

  In pieces of a meteorite, scientists have found tiny mineral grains that are older than the Sun and the solar system, which formed about 4.6 billion years ago. Some of these “presolar grains,” the researchers found, are between five and seven billion years old, making them the oldest known materials on Earth.  The grains initially formed in interstellar space out...

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Gravitational waves reveal a second neutron star collision

Thursday, January 9th 2020 06:23 PM

  For just the second time, scientists have used gravitational waves (ripples in space-time) to detect the merger of two colliding neutron stars. The neutron stars — which each cram roughly the mass of the Sun into a city-sized space — have a combined mass greater than any other pair of neutron stars ever observed. “From conventional observations with light, we already k...

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When Betelgeuse goes supernova, what will it look like from Earth?

Wednesday, February 19th 2020 08:41 PM

A plume of gas nearly the size of our solar system erupts from Betelgeuse's surface in this artist's illustration of real observations gathered by astronomers using the Very Large Telescope in Chile.   If you stargaze on a clear winter night, it’s hard to miss the constellation Orion the Hunter, with his shield in one arm and the other arm stretched high to the heavens. A...

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How many planets are there in the universe?

Thursday, February 13th 2020 06:04 PM

  Astronomers estimate that there is roughly one exoplanet per star in our galaxy. Of course, some stars have many planets – our own Sun has eight. And some stars have none. But if a star lives long enough, forming planets seems to be the rule, rather than the exception.That doesn’t mean astronomers can map all of those billions of stars though. When it comes to exopl...

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This huge, distant galaxy formed all its stars really fast

Thursday, February 6th 2020 11:20 PM

  Extra-massive galaxies are rare, though not unheard of, in the early universe. Now, a team of astronomers has identified a huge galaxy that had to have formed its stars super fast — more than 1000 suns’ worth of stars per year at its peak — so that it was done making stars just 1.8 billion years after the Big Bang.  Astronomers typically expect that any large...

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