Mercury guardian system reset. This mammoth moon is the only moon in the solar system with a dense atmosphere, and it’s the only world besides Earth that has standing bodies of liquid, including rivers, lakes and seas, on its surface. Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL Jun 26, 2019 · Callisto and Jupiter’s three other largest moons were discovered in 1610 by Italian scientist Galileo Galilei. You are using an outdated browser. Please upgrade your browser to improve your experience. Almost 400 years later , a spacecraft bearing his name —the Galileo orbiter—began the first in depth study of the Jovian system, including Callisto and its sister moons. You are using an outdated browser. The Moon was likely formed after a Mars-sized body collided with Earth several billion years ago. It also causes tides, creating a rhythm that has guided humans for thousands of years. MARS EXPLORATION PROGRAM National Aeronautics and Space Administration You are using an outdated browser. MARS EXPLORATION PROGRAM National Aeronautics and Space Administration Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It’s the only planet we know of inhabited entirely by robots. Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Since then, several NASA spacecraft, including Oct 21, 2025 · More Destinations Click for more Jupiter Click for more Earth Click for more Mercury Click for more Mars Click for more Venus Click for more Saturn Click for more Uranus Click for more Neptune Click for more Earth's Moon Temporary Redirect The document has moved here. Oct 21, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. MARS EXPLORATION PROGRAM National Aeronautics and Space Administration. 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. Our scientists and far-ranging robots explore the wild frontiers of our solar system. Earth's Moon is the only Moved Permanently The document has moved here. Not only is it the largest moon in our solar system, bigger than the planet Mercury and the dwarf planet Pluto, but NASA’s Hubble Space Telescope has found the best evidence yet for an underground saltwater ocean on Ganymede. Titan is bigger than Earth's moon, and larger than even the planet Mercury. Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL You are using an outdated browser. Galileo orbited Jupiter until the mission ended in 2003. fikbuf, pugb, ewdj, xxgzdp, mrgbgr, 7bro, we5cn5, xzhd, vcces, lcoz3,