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Scientists find meteorite pieces older than the solar system

Monday, January 13th 2020 03:09 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 10:23 AM

  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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NASA telescope discovers its first planet orbiting two stars

Tuesday, January 7th 2020 03:55 PM

  Since its launch in 2018, NASA's space-based TESS Telescope has discovered at least 37 confirmed exoplanets and identified more than 1,500 exoplanet candidates. And now, it has uncovered its first Tatooine-like circumbinary planet — a world that orbits two stars instead of one. Astronomers have found only a handful of such circumbinary planets so far. But...

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Pluto is the most famous demoted planet, but it's not the first

Thursday, December 19th 2019 11:06 AM

  As an astronomer, the question I hear the most is why isn’t Pluto a planet anymore? More than 10 years ago, astronomers famously voted to change Pluto’s classification. But the question still comes up. When I am asked directly if I think Pluto is a planet, I tell everyone my answer is no. It all goes back to the origin of the word “planet.” It comes from...

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Jupiter's Galilean moons likely formed bit by bit from pebbles

Wednesday, December 11th 2019 01:47 PM

  Even in a backyard telescope, the four largest moons of Jupiter are big enough to be seen as little specks of light. And while humans have known about these “Galilean satellites” for centuries, there are still a lot of unanswered questions about how the moons formed.  Now, a team of researchers has proposed a possible history for the moons that better explains mor...

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How the icy moon Enceladus got 'tiger stripes' at its south pole

Tuesday, December 10th 2019 04:09 PM

  Saturn’s icy moon Enceladus sports a series of parallel, evenly spaced stripes at its south pole. Scientists believe these stripes are long fissures in the icy shell that covers the moon's subsurface liquid water ocean. But astronomers still aren’t sure how these fissures formed, why they’re so evenly spaced or why other icy worlds don’t have them. Now, a t...

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