Planet 9 is Running out of Places to Hide - by BrianKoberlein
We have a pretty good idea of what lurks within our solar system. We know there isn’t a Mars-sized planet orbiting between Jupiter and Saturn, nor a brown dwarf nemesis heading our way. Anything large and fairly close to the Sun would be easily spotted. But we can’t rule out a smaller, more distant world, such as the hypothetical Planet 9 . The odds against such a planet existing are fairly high, and a recent study finds it even less likely.
Many astronomers have wondered about the existence of planets that might hide at the edge of our solar system, particularly when the power of our telescopes were fairly limited. But as large sky surveys started to scan the heavens they found nothing beyond asteroid-sized worlds. But the orbits of the worlds we did find seemed to be, as if they were being gravitationally perturbed by a larger object.
Naturally, this motivated folks to search for the world, but it isn’t easy. Planet 9 would be too distant to be seen by reflected light, so you’d have to look for it by its faint infrared glow. And with a mass of only five Earths, it wouldn’t give off much heat. Adding to this is the fact that such a distant planet would orbit very slowly, such that within a single set of observations you wouldn’t notice it move at all. This is where this new study comes in.
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