In Depth | Our Solar System – NASA Solar System Exploration
Of the eight planets, Mercury and Venus are the only ones with no moons. The giant planets Jupiter and Saturn lead our solar system’s moon counts. In some ways, the swarms of moons around these …
Mercury 3D Model – NASA Solar System Exploration
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About the Planets - NASA Solar System Exploration
May 28, 2025 · The first four planets from the Sun are Mercury, Venus, Earth, and Mars. These inner planets also are known as terrestrial planets because they have solid surfaces.
In Depth | Moons – NASA Solar System Exploration
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. In the outer solar system, the gas giants Jupiter …
Planet Compare - NASA Solar System Exploration
Oct 21, 2025 · 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 | Ganymede – NASA Solar System Exploration
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 …
Mars By the Numbers - NASA Solar System Exploration
Oct 21, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.
In Depth | Earth's Moon – NASA Solar System Exploration
Quick Facts Radius 1,079.6 miles | 1,737.5 kilometers Distance from Earth 238,855 miles | 384,400 kilometers
In Depth | 2P/Encke – NASA Solar System Exploration
NASA's MESSENGER spacecraft imaged comet 2P/Encke during its closest approach of the planet Mercury at 22:56 UTC on November 17. Image Credit: NASA/Johns Hopkins University Applied …
Jupiter - NASA Solar System Exploration
Jan 13, 2026 · Facts About Jupiter Jupiter is the largest and oldest planet in our solar system. If Jupiter was a hollow shell, 1,000 Earths could fit inside. But the "King of Planets" is no lumbering giant — …