00:00The Ammonite Enigma. A more dynamic universe.
00:04A recent discovery is shaking up our understanding of the outer solar system.
00:09Ammonite, this newly found TNO, is a rare setenoid meaning.
00:13Its orbit is so far from the sun that Neptune's gravity barely influences it.
00:18What's astonishing is that while Ammonite's orbit appears stable for billions of years,
00:23it's substantially different from that of its setenoid companions.
00:26Numerical simulations reveal that all four known setenoids, including SEDNO itself,
00:32shared similar orbits approximately 4.2 billion years ago.
00:36This striking divergence, occurring about 400 million years after our solar system's birth,
00:41implies that something dramatic happened in the outer solar system,
00:45even imposing new restrictions on the potential location of the hypothetical planet 9
00:49and reducing its probability.
00:51The gravitational landscape of the early outer solar system must have been highly dynamic,
00:57possibly involving planetary migration or even the ejection of a large body.
01:02Ammonite opens a new window into understanding the solar system's past,
01:06revealing cosmic events still waiting to be uncovered.
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