In case you missed them, here’s a few new stories I’ve published recently. Thanks as usual to all my excellent editors. For the Atlantic piece, I included a paragraph (in parentheses) that didn’t make the final cut.
Is Planet Nine Even Real?
A year and a half after it was proposed, astronomers are still debating whether the giant mystery planet actually exists.
When Mike Brown first proposed that a hidden, massive planet lurks in the outer reaches of our solar system, he was confident someone would prove him wrong. “Planet Nine,” as the hypothetical world was nicknamed, was his explanation for the strange movements of half a dozen distant, icy planetoids that are farther away and smaller than Pluto: In theory, this huge, somehow-undiscovered planet could sway their orbits. But surely astronomers would be quick to find a more obvious explanation.
“Shockingly, in a year and a half, nobody has,” says Brown, an astronomer at the California Institute of Technology. “There have been so many claims of planets in the last 170 years, and they were always wrong. But I’m clearly a true believer at this point.”
Brown, the self-titled “Pluto Killer” who led the campaign that demoted the dwarf planet, and Konstantin Batygin, his coauthor at Caltech and a young star who plays in his own rock band, know how to spark debate. Since their proposal about Planet Nine, the lack of definitive evidence for or against its existence has divided the planetary community. Other astronomers have put forth alternative explanations, and some contend Brown and Batygin’s data are biased. Until someone clearly spots the new mystery planet in a telescope, they’ve come to an impasse…
Incidentally, both Batygin and Madigan invoke the principle of Occam’s razor, the notion that the simplest explanation is likely the correct one. But they come to completely different conclusions, highlighting that this seemingly straightforward principle is actually rather complicated, with no clear answer yet in sight.
(In a historical parallel, Brown and Batygin are about the same age as Niels Bohr, already a Nobel laureate, and Werner Heisenberg, an up-and-coming physicist trying to make a name for himself, when they famously clashed with Einstein about how to interpret bizarre observations in quantum mechanics. Bohr’s view ultimately became the “standard” one, but a few holdouts still follow Einstein’s. Nearly 90 years later, some say the dispute remains unresolved.)
[Read the entire piece on The Atlantic, published on 8 December.]