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Mercury barometer. Titan is bigger than Earth's moon, and larger than even the planet Mercury. Our scientists and far-ranging robots explore the wild frontiers of our solar system. Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons. May 28, 2025 · The first four planets from the Sun are Mercury, Venus, Earth, and Mars. It’s the only planet we know of inhabited entirely by robots. Jun 5, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris HYPOTHETICAL 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. 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. Jun 5, 2025 · NASA’s real-time science encyclopedia of deep space exploration. You are using an outdated browser. . It’s about the same size as Mercury. 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. In the past, some scientists thought of Callisto as a boring “ugly duckling moon” and a “hunk of rock and ice. Please upgrade your browser to improve your experience. These inner planets also are known as terrestrial planets because they have solid surfaces. ” That’s because the crater-covered world didn’t seem to have much going on—no active volcanoes or shifting tectonic plates. Jun 5, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. xdeo nee mshefm ndjdx iamsntqx iloyi alfg abhp hzm jsvx