The nucleus of the comet in diameter reach at least a kilometer.
American astronomers have discovered that long-period comets, the core of which the diameter is not less kilometers, about seven times more than previously thought. A study published in the Astronomical Journal.
Experts also estimate that long-period comets (i.e., with the orbital period of 200 years) on average twice more, than the same celestial bodies, the movement of which is determined by the gravitational influence of Jupiter. Recent objects revolve around the Sun with a period of about 20 years.
To specify the number of the authors managed after were analysed the infrared telescope WISE (Wide-Field Infrared Survey Explorer). Experts for the first time to estimate the size of the nuclei of long-period comets, which are usually masked by the coma — hazy dust shell of a celestial body.
The chemical composition of comets has changed little since the formation of the Solar system. Some of the water fell to the Ground, probably from the data of celestial bodies. Their study allows us to understand the early history of the planet.
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