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Learn about the eight planets and five dwarf planets in our solar system, their sizes, locations, features, and exploration missions. Find out what makes a planet a planet, and whether there is another planet in the solar system.
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Our solar system consists of our star, the Sun, and...
- In Depth
A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk.
Learn about the Sun, planets, moons, and other bodies that orbit our star. Find out how our solar system formed, how big it is, and what makes it unique.
Hace 5 días · Learn about the eight planets in our solar system, their features, and how we explore them. Find out facts, pictures, and activities for each planet on this web page.
Un planeta es un objeto astronómico que orbita una estrella y que es lo suficientemente masivo como para ser redondeado por su propia gravedad, pero no lo suficientemente masivo como para causar fusión termonuclear, y que ha despejado su región vecina de planetesimales . Evolución del concepto de planeta. Véase también: Historia de la astronomía.
Learn about the history and evolution of the definition of a planet, from ancient Greek to modern IAU standards. Explore the characteristics and examples of planets, dwarf planets, and other objects in the solar system.
