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By the Numbers
Neptune is the eighth and most distant planet from the Sun. It's the fourth largest, and the first planet discovered with math. ... Source: JPL Solar System Dynamics website. Page Updated: May 16, 2024. Return to top. The National Aeronautics and Space Administration. ... Responsible NASA Official for Science: Dana Bolles ...
Exploration
1846: Using mathematical calculations, astronomers discover Neptune, increasing the number of known planets to eight. Neptune's largest moon, Triton, is found the same year. 1983: Pioneer 10 crosses the orbit of Neptune and becomes the first human-made object to travel beyond the orbits of the planets of our solar system. The spacecraft remains ...
Stories
Encountering Neptune in 1989, NASA's Voyager mission completed humankind's first close-up exploration of the four giant outer planets of our solar system. Collectively, since their launch in 1977, the twin Voyager 1 and Voyager 2 spacecraft discovered that Jupiter, Saturn,…
Solar System Home
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. ... A real-time visualization of our solar system using planetary science data. NASA/JPL-Caltech. Featured Resources. ... Encountering Neptune in 1989, NASA's Voyager mission completed humankind's ...
Mercury
Mercury is the smallest planet in our solar system and the nearest to the Sun. Mercury is only slightly larger than Earth's Moon. It's the fastest planet, zipping around the Sun every 88 Earth days.
Venus
Venus is the second planet from the Sun, and the sixth largest planet. It's the hottest planet in our solar system. Venus is a cloud-swaddled planet and our nearest planetary neighbor.