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  • In Depth | Our Solar System – NASA Solar System Exploration
    The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy 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 Beyond our own solar system, there
  • In Depth | Moons – NASA Solar System Exploration
    In Depth Moons – also called natural satellites – come in many shapes, sizes and types They are generally solid bodies, and few have atmospheres Most planetary moons probably formed out the discs of gas and dust circulating around planets in the early solar system
  • Planet Compare - NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • In Depth | Kuiper Belt – NASA Solar System Exploration
    The differences between these two types of bodies in the classical Kuiper Belt have everything to do with Neptune The cold classical KBOs have orbits that never come very close to Neptune, and thus they remain "cool" and unperturbed by the giant planet's gravity Their orbits likely haven't moved much for billions of years
  • In Depth | Sun – NASA Solar System Exploration
    The heliosphere extends beyond the orbit of the planets in our solar system Thus, Earth exists inside the Sun’s atmosphere Outside the heliosphere is interstellar space The core is the hottest part of the Sun Nuclear reactions here – where hydrogen is fused to form helium – power the Sun’s heat and light
  • In Depth | Asteroids – NASA Solar System Exploration
    In Depth Asteroids, sometimes called minor planets, are rocky remnants left over from the early formation of our solar system about 4 6 billion years ago The current known asteroid count is: Most of this ancient space rubble can be found orbiting our Sun between Mars and Jupiter within the main asteroid belt
  • In Depth | Ganymede – NASA Solar System Exploration
    The discovery eventually led to the understanding that planets in our solar system orbit the Sun, instead of our solar system revolving around Earth (Jupiter now has 53 named moons and 26 provisional moons awaiting confirmation of discovery)
  • In Depth | Europa – NASA Solar System Exploration
    In fact, the Galilean moons are sometimes called a “mini solar system” since they formed from the leftovers of Jupiter similar to how Earth and other planets formed from gas and dust left over from the formation of the Sun The similarities don’t end there
  • In Depth | Callisto – NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • Kuiper Belt and Oort Cloud - NASA Solar System Exploration
    In contrast, short-period comets take less than 200 years to orbit the Sun and they travel along the plane in which most of the planets orbit They are thought to come from the Kuiper Belt or from the so-called scattered disc, a dynamic zone created by the outward motion of Neptune that contains many icy objects with eccentric orbits





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