A Ninth Planet Once Again?

Ninth Planet May Exist Beyond Pluto, Scientists Report
By KENNETH CHANG JAN. 20, 2016

There might be a ninth planet in the solar system after all, and it is not Pluto.

Two astronomers reported on Wednesday that they had compelling signs of something bigger and farther away — something that would satisfy the current definition of a planet, where Pluto falls short.

“We are pretty sure there’s one out there,” said Michael E. Brown, a professor of planetary astronomy at the California Institute of Technology.

What Dr. Brown and a fellow Caltech professor, Konstantin Batygin, have not done is actually find that planet, so it would be premature to start revising mnemonics of the planets.

In a paper published in The Astronomical Journal, Dr. Brown and Dr. Batygin laid out a detailed circumstantial argument for the planet’s existence in what astronomers have observed: a half-dozen small bodies in distant elliptical orbits.

What is striking, the scientists said, is that the orbits of all six loop outward in the same quadrant of the solar system and are tilted at about the same angle. The odds of that happening by chance are about 1 in 14,000, Dr. Batygin said.

Read the entire article as:
http://www.nytimes.com/2016/01/21/science/space/ninth-planet-solar-system-beyond-pluto.html

See also: http://earthsky.org/space/why-planet-nine-might-be-for-real

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Margo Laughton

Margo Laughton

Limited to two dimensions, exploring a 3rd

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