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Internet Search Results
In Depth | 1P/Halley – NASA Solar System Exploration
The History of Halley's Comet Until the time of English astronomer Edmond Halley (1656-1742), comets were believed to make only one pass through the solar system. But in 1705, Halley used Isaac Newton's theories of gravitation and planetary motions to compute the orbits of several comets.
Asteroids, Comets & Meteors - NASA Solar System Exploration
Asteroids and comets – and the meteors that sometimes come from them – are leftovers from the formation of our solar system 4.6 billion years ago.
In Depth | Kuiper Belt – NASA Solar System Exploration
Objects that remain there occasionally collide, producing smaller objects fragmented by the collision, sometimes comets and also dust that's blown out of the solar system by the solar wind. Structure and Characteristics The Kuiper Belt represents an enormous, donut-shaped volume of space in the outer solar system.
In Depth | Our Solar System – NASA Solar System Exploration
The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. 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. Beyond our own solar system, there ...
In Depth | 19P/Borrelly – NASA Solar System Exploration
How Comet 19P/Borrelly Got Its Name Comets are usually named for their discoverer (s) or for the name of the observatory or telescope used in the discovery. Since Alphonse Borrelly discovered this comet, it is named after him. The letter "P" indicates that 19P/Borrelly is a "periodic" comet, meaning it has an orbital period of less than 200 years.
Hubble Detects Comets Beyond Neptune - NASA Solar System Exploration
HUBBLE IDENTIFIES A LONG-SOUGHT POPULATION OF COMETS BEYOND NEPTUNE NASA's Hubble Space Telescope has detected a long-sought population of comets dwelling at the icy fringe of the solar system. The observation, which is the astronomical equivalent to finding the proverbial needle-in-haystack, bolsters proof for a primordial comet reservoir just beyond Neptune, currently the farthest planet ...
Directory - NASA Solar System Exploration
NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
Kuiper Belt and Oort Cloud - NASA Solar System Exploration
The Kuiper Belt should not be confused with the Oort Cloud, which is a thousand times more distant. In 1950, astronomer Jan Oort proposed that certain comets come from a vast, extremely distant spherical shell of icy bodies surrounding the solar system. This giant swarm of objects, now named the Oort Cloud, occupies space at a distance between 5,000 and 100,000 astronomical units. No objects ...
In Progress - NASA Solar System Exploration
NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
Directory - NASA Solar System Exploration
He has observed and imaged 40 comets over the last 40 years. He is also an accomplished astrophotographer specializing in deep sky objects as well as solar and planetary imaging. He has a long history of public outreach and has brought his telescopes and love of astronomy to many boy & girl scouts and school children.
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