31 Jul '17, 11pm

Is There a Giant Planet Lurking Beyond Pluto? - @IEEESpectrum // #space #science

, an astronomer at Yale University, says, “Our best estimate for its current position and brightness put it about 950 times farther than Earth from the sun.” As faint as the tiniest moons of Pluto, Planet Nine would be barely two pixels wide on the Hubble Space Telescope’s camera. Searchers could easily miss it among random speckles of sensor noise and the twinkling of distant and variable stars. And because the planet is so far from Earth, near the far end of a highly elliptical path that takes at least 15,000 years to complete, astronomers have to wait a day or more between successive photographs of the right patch of sky to see the planet shift its apparent position relative to the much more distant stars.

Full article: http://spectrum.ieee.org/aerospace/satellites/is-there-a-...

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