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The most massive planet listed on the NASA Exoplanet Archive is DENIS-P J082303.1−491201 b, [115] [116] about 29 times the mass of Jupiter, although according to most definitions of a planet, it is too massive to be a planet and may be a brown dwarf instead.
The earliest scientist to study and produce a paper using crater counting as an age indicator was Ernst Öpik, an Estonian astronomer and astrophysicist. [6] Ernst Öpik utilized the crater counting method to date the Moon's Mare Imbrium to be approximately 4.5 billion years of age, estimating the maria to be about 1000 years younger than the contintentes. [6]
The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...
But eventually more planets of other sorts were found, and it is now clear that hot Jupiters make up the minority of exoplanets. [64] In 1999, Upsilon Andromedae became the first main-sequence star known to have multiple planets. [67] Kepler-16 contains the first discovered planet that orbits a binary main-sequence star system. [68]
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.
The discovery of K2-33b is notable for explaining how close-in planets form, an open question in the field of exoplanets since the discovery of the first exoplanet, 51 Pegasi b, in 1995. Given the young age of this exoplanet, several theories of planetary migration can be ruled out because they take too long to form close-in planets.
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The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). It suggests the Solar System is formed from gas and dust orbiting the Sun which clumped up together to form the planets.