In Depth | Asteroids - NASA Solar System Exploration
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 …
Asteroids, Comets & Meteors - NASA Solar System Exploration
Our solar system’s small bodies – asteroids, comets, and meteors – pack big surprises. These chunks of rock, ice, and metal are leftovers from the formation of our solar system 4.6 billion …
In Depth | Perseids – NASA Solar System Exploration
Meteors come from leftover comet particles and bits from broken asteroids. When comets come around the Sun, they leave a dusty trail behind them. Every year Earth passes through these …
Planet Compare - NASA Solar System Exploration
2025年1月9日 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
Vesta and Ceres: What We Knew About These Worlds Before and …
2018年8月16日 · Their non-random distribution seems to indicate that they are the result of low-energy impacts by carbon-bearing asteroids that delivered the darker material to Vesta and …
Asteroids are leftover rocky parts of the solar system. Some have not changed very much in 4.5 billion years and some have partly melted. Others have completely melted and formed iron …
In Depth | Oumuamua – NASA Solar System Exploration
The first known interstellar object to visit our solar system, 1I/2017 U1 ‘Oumuamua, was discovered Oct. 19, 2017 by the University of Hawaii’s Pan-STARRS1 telescope, funded by …
In Depth | 1P/Halley – NASA Solar System Exploration
Asteroids, Comets & Meteors 1P/Halley In 1986, the European spacecraft Giotto became one of the first spacecraft ever to encounter and photograph the nucleus of a comet, passing and …
In Depth | Our Solar System - NASA Solar System Exploration
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 …
In Depth | 2P/Encke – NASA Solar System Exploration
Asteroids, Comets & Meteors 2P/Encke NASA's MESSENGER spacecraft imaged comet 2P/Encke during its closest approach of the planet Mercury at 22:56 UTC on November 17.