Trans-Neptunian object

related topics
{math, energy, light}
{@card@, make, design}
{acid, form, water}
{household, population, family}
{island, water, area}
{style, bgcolor, rowspan}
{math, number, function}

A trans-Neptunian object (TNO; also written transneptunian object) is any minor planet in the Solar System that orbits the Sun at a greater distance on average than Neptune. The Kuiper belt, scattered disk, and Oort cloud are three divisions of this volume of space.[1]

The first trans-Neptunian object to be discovered was Pluto in 1930. It took more than 60 years to discover, in 1992, a second trans-Neptunian object, (15760) 1992 QB1, with only the discovery of Pluto's moon Charon before that in 1978. Since then however, over 1,000 trans-Neptunian objects have been discovered, differing in sizes, orbits, and surface composition. 198 of these (as of November, 2009) have their orbit well enough determined that they are given a permanent minor planet designation.[2][3]

The largest known trans-Neptunian objects are Pluto and Eris, followed by Makemake and Haumea.


Full article ▸

related documents
Elastic collision
Tidal locking
Michelson–Morley experiment
Centimetre gram second system of units
Stimulated emission
Comet Hyakutake
Solar wind
Fundamental interaction
Electric current
Exotic matter
Dyson sphere
Earth's magnetic field
Van Allen radiation belt
Hubble's law
Interstellar medium
Celestial mechanics
Electric potential
Accretion disc
Comet Hale-Bopp
Measuring instrument
Quantum chromodynamics
Fine-structure constant