Five-planet Nice model distant massive ninth planet is responsible for the alignment of the perihelia of several trans-Neptunian objects with semi-major axes greater than 250 AU. Although the mechanism for the ejection of the fifth giant planet in the five-planet Nice model is reminiscent of the origin of Planet Nine, with a gravitational instability including an encounter with Jupiter, it is unlikely to be the same planet. The estimated timing of the capture of Planet Nine onto its distant orbit, three to ten million years after the formation of the Solar System, when the Sun was still in its birth cluster, is inconsistent
What Is Love? (EP) Korean album in April. On March 25, the agency announced that Twice would release their fifth EP titled "What Is Love?" on April 9. The first group image teaser was uploaded online the next day. The EP was released as a digital download on various music sites on April 9 while the physical album was released the following day. "Stuck", which was initially a "CD-only" track on the physical album, was released digitally on April 30. Credits adapted from album liner notes. What Is Love? (EP) What Is Love? (stylized as What is Love?) is the fifth extended play (EP)