I'm very intrigued by Oumuamua, a cigar-shaped interstellar object travelling in our Solar System which is speculated to constitute an alien artifact instead of cataloged as a comet since no tail of gas or dust was spot, but it is posited that its long journey in deep space is what caused the tail to disappear and the gases be trapped inside. This object may be studied closely in the future, by sending a spacecraft.
The Standard Model of Particle Physics is the model defining all known elementary particles, consisting of Fermions and Bosons. Fermions consist of six quarks and six antiquarks, and six leptons and antileptons. Bosons consist of Gauge and Higgs: Gauge the mediators of fundamental forces, carrying momentum between interacting particles, Higgs generating the masses of fermions and other particles through Higgs Fields.
Exoplanets, defined as planets beyond our solar system, can either orbit other stars or be untethered by such and orbit the galactic center. Measuring mass and diameter allows to discern their composition, for example rocky or gaseous; they are made of elements similar to the ones present in the planets of our solar system, but the proportions of such may differ: water worlds, lava worlds, egg-like and so on.
Zoro will presumably be the one to kill Kaido. Luffy never killed characters advertently, and Oda has been portraying Kaido's words "perfection can only be found with death" probably for a reason in that so specific, and also Zoro's specific declaration himself. And all those experiments Kaido conducted on his own body. Put all elements together.
Although Newton described gravity as a force acting between masses, Einstein proposed, according to General Relativity, that gravity is the by-product induced by mass/energy in a curved spacetime, and caused by an uneven distribution of these. They dictate spacetime how to bend, and gravity is just the falling of objects along this bending. So even light, albeit massless, can be affected or even generate gravity.