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In Depth | Earth – NASA Solar System Exploration

While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.

Solar System Exploration

The solar system has one star, eight planets, five dwarf planets, at least 290 moons, more than 1.3 million asteroids, and about 3,900 comets.

Overview | Mars – NASA Solar System Exploration

Mars is one of the most explored bodies in our solar system, and it''s the only planet where we''ve sent rovers to roam the alien landscape. NASA currently has two rovers ( Curiosity and Perseverance ), one lander ( InSight ), and one helicopter ( Ingenuity ) exploring the surface of Mars.

In Depth | Our Solar System – NASA Solar System Exploration

Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

What is a Planet? | Planets – NASA Solar System Exploration

A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

Solar System: Facts

10 Things. Our solar system is made up of a star, eight planets, and countless smaller bodies such as dwarf planets, asteroids, and comets. Our solar system orbits the center of the Milky Way galaxy at about 515,000 mph (828,000 …

Planet Compare – NASA Solar System Exploration

Planet Compare. NASA''s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

Terrestrial Planets

Learn about the four terrestrial planets in our solar system: Earth, Mars, Mercury and Venus. Compare their features, sizes and orbits with NASA''s data.

Planets

The solar system has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are five officially recognized dwarf planets in our solar system: Ceres, Pluto, Haumea, Makemake, and Eris.

Planet Sizes and Locations in Our Solar System

Our solar system has eight planets, and five officially recognized dwarf planets. Which planet is biggest? Which is smallest? What is the order of the planets as we move out from the Sun?