00:03What if I told you our solar system had another mysterious planet?
00:07It's not a terribly new concept, but as our telescopic technology gets better,
00:11we're finding more evidence that another planet might just be out there.
00:14A big part of that evidence is the orbit of objects out beyond dwarf planet Pluto in the Kuiper Belt.
00:19Those objects move in a much more oval orbit,
00:22and when simulations of gravitational models are used to figure out why,
00:26they suggest that not only is another planet likely lurking out there,
00:29but also that it's a large one, 10 times the mass of Earth or more.
00:33So why haven't we been able to capture a glimpse of it yet?
00:35Well, if it is out there, experts say it's likely 20 times the distance that Neptune is to the Sun,
00:40and Neptune is more than 2.5 billion miles from it,
00:44meaning this planet would be 55.4 billion miles from the Sun.
00:48That's made even more difficult since we can only look for it at certain times of the year during moonless
00:52nights.
00:52And it's even harder since the primary way we look for distant planets is to watch for a dip in
00:57light
00:57as it passes in front of its orbiting star,
00:59which is impossible when we're so much closer than it is to ours.
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