The shape of a planet's orbit is one of its fundamental properties, along with its size and distance from its host star.

Planets in the solar system. Credit: NASA and ESA / CC BY-SA 4.0 A rare celestial event will unfold on the evening of Friday, Feb. 28, 2025, when seven planets line up in the night sky in a phenomenon ...

Mar. 11, 2025 — A new study presents a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are 1 to 4 times the size of Earth and among the most common in ...

Planets change orbit shape around Neptune’s size. Metal-rich stars help giant planets form. Eccentric orbits suggest chaotic planet formation.

Several times during this project, I identified failure modes ... and becomes a gas giant like Jupiter and Saturn in our solar system. Planets larger than Neptune are somewhat rare because they ...

Exciting new research suggests there are four miniature planets orbiting Barnard’s Star, each thought to be just 20 to 30% ...

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"These objects really could be anywhere in the solar system at any given time." One million alien visitors from another star system could already be lurking in the solar system. We aren't talking ...

NASA engineers are turning off two instruments on Voyager 1 and Voyager 2 to ensure these twin spacecraft can continue ...