Strange asteroid may have been born in another star system

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Strange Asteroid May Be A Permanent Alien Guest

strange asteroid 2015 BZ509

The strange asteroid 2015 BZ509 (circled), which may have been born orbiting another star before getting kicked out and joining our Solar System. [Credit: C. Veillet/LBTO]

For Forbes:

Last fall, an asteroid we named ʻOumuamua passed through the Solar System. Its visit marked the first time we’ve identified an object inside the Solar System that definitely came from outside. However, a new study argues that we might have a more permanent interstellar guest: a weird asteroid called 2015 BZ509.

Thousands of asteroids swarm around Jupiter’s orbit, but they all orbit the same direction as the giant planet except 2015 BZ509. This weirdo orbits the opposite direction — “retrograde” in technical terms — at a highly tilted angle. Fathi Namouni and Helena Morais performed a computer simulation which demonstrates that 2015 BZ509 could stay in its orbit for billions of years, but it’s unlikely it formed there when the rest of the Solar System was born. Instead, the authors argue, it probably originated outside the Solar System and drifted in, where it was captured by gravity.

[Read the rest at Forbes]

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To know if there are aliens, we need to ask the right questions

[ This blog is dedicated to tracking my most recent publications. Subscribe to the feed to keep up with all the science stories I write! ]

Are We Alone in the Universe?

Panel from “Are we alone?”, a comic written by me with art by Maki Naro. [Credit: Maki Naro (art)/moi (words)]

How can we know if life exists elsewhere in the cosmos? To answer that question, we have to place Earth — and Earth life — in the context of other worlds in the Solar System and beyond. In my latest comic for The Nib with Maki Naro, we look at the science of planetary chemistry and the conditions of habitability as we know them, with the help of Johns Hopkins astrochemist Sarah Hörst and American Astronomical Society Public Policy Fellow Ashlee Wilkins.

It ain’t aliens — but this weird-looking star is still interesting

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We Haven’t Found Alien Megastructures… Yet

The mystery formations and data discrepancies of Tabby’s Star turned out to have explanations. But that’s not what’s important about the mystery star.

For The Daily Beast:

For a second, we thought they were aliens.

In the case of Tabby’s Star—the star more formally known as KIC 8462852—the data (an an accompanying photo of towering figures) was weird enough that a few people surmised it maybe pointed to a sign of an alien civilization. The odds were never good, and a paper published earlier this week shows that aliens almost certainly aren’t involved.

Instead, astronomers think the abnormalities are probably either dust orbiting the star, fragments of comets, or even variations in “weather” on the star’s surface.

These possibilities are a lot more boring than aliens, but that doesn’t mean Tabby’s Star isn’t interesting. The very fact that we still don’t know exactly what’s going on (other than “it ain’t aliens”) is itself interesting.

[Read the rest at The Daily Beast]