Comets are Solar system bodies having the form of vague objects, usually with pale clot kernel in the center and tail. They are among the most beautiful celestial bodies. hazy Bright shell surrounding a core of hazy, long tail, extending sometimes to half the sky, fast motion among the stars – all this makes comet different from other heavenly bodies. The comet can be observed when a small ice body, called the nucleus of the comet is approaching the Sun at a distance that is less than 4-5.e. warmed by the sun, and it begins to stand out gases and dust that are visible as a result of their illumination by the Sun.
Gases and dust released from the nucleus, creating around him a hazy shell – atmosphere of the comet, components along with the core of the head of the comet. The atmosphere of a comet continuously dissipates in interplanetary space: under the action of radiation pressure and interaction with the solar wind gases and dust are carried away in the direction from the Sun forming the comet’s tail.
Most of the comets in the middle of the head there is a bright star-like “core”, representing the illumination of the Central, most dense zone of true gases around the comet’s nucleus. Continue reading
Space gives us presents!
Great Christmas gift for fans of astronomy this winter. Comet Catalina (C /2020 US 10) flies to the Ground. Most of 2015, she traveled across the sky of the southern hemisphere of the Earth. November 20 just a few seconds it appeared on the sky of the Northern hemisphere. Watch it at the end of November, it was incredibly difficult. The comet only appeared in the wee hours very close to the horizon. All who are engaged in astronomical observations, you know how difficult it is to see such an object in the starry sky. However, every day the conditions of observation of comets improve. Every night of the comet increases the height of the lift above the horizon by 1 degree, which is two visible diameter of the moon. New year’s eve the comet will appear just after midnight and is visible until dawn. And from mid-January, after the “old New year”, the comet will be visible all the dark.
October 3, 2015, the comet was in the constellation of Centaurus. Photo: Martin Mobberley
For the last time this is the most brilliant and unpredictable comet that visited our Solar system. Comet Catalina came to us from the Oort cloud. Scientists believe that the Oort cloud is formed from comets and the remnants of “construction debris” thrown from Solnechnoye when it was created. Continue reading
Comets fascinate the human mind since ancient people first noticed the white tail streaking through the night starry sky. We remember the date when the comet flies past the Earth once a century or even less often and remember all our lives. In the middle ages in Europe, the appearance of comets was often linked to various natural disasters and diseases. In religion, these heavenly bodies also play an important role. For example, in the New Testament, the comet heralded the birth of Christ.
Astronomers find comets also interesting and fascinating space objects, because they are witnesses of great historical events and even carry evidence of them.
The comet is a relatively small object in our solar system, usually having a diameter of several kilometers. Sometimes called “dirty snowballs” because of their component substances. Usually comets are composed of the following four elements:
Ice (water, ammonia, methane, carbon dioxide)
Some organic materials (e.g., resin)
Rocky ground (optional) Continue reading