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The earliest such stories tended to depict impacts by comets, [a] though other objects such as asteroids and meteoroids became more common in the 1900s. [2] Impact events from more massive celestial objects also appear on occasion. [ 1 ]
Outside of literature, impact events—both by comets and other objects such as asteroids—appeared only infrequently for most of the 1900s; the impact of Comet Shoemaker–Levy 9 on Jupiter in 1994 was followed by a sharp increase in depictions of such events across film, television, and video games.
As space objects go, comets and meteors are not very big. The largest asteroid, Ceres, is only about 600 miles wide. Fascinating recent discoveries about comets and meteors in our solar system
The finding is unexpected because comets, not asteroids, are typically considered to "sprout jets and plumes". According to one of the scientists, "The lines are becoming more and more blurred between comets and asteroids." [103] Findings have shown that solar winds can react with the oxygen in the upper layer of the asteroids and create water ...
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Short-period comets with orbital periods less than 20 years and low inclinations (up to 30 degrees) to the ecliptic are called traditional Jupiter-family comets (JFCs). [ 83 ] [ 84 ] Those like Halley, with orbital periods of between 20 and 200 years and inclinations extending from zero to more than 90 degrees, are called Halley-type comets (HTCs).
Antimatter comets and antimatter meteoroids are hypothetical comets and meteoroids composed solely of antimatter instead of ordinary matter.Although never actually observed, and unlikely to exist anywhere within the Milky Way, they have been hypothesized to exist, and their existence, on the presumption that hypothesis is correct, has been put forward as one possible explanation for various ...
While the event is generally held to have been caused by a meteor air burst, several alternative explanations have been proposed both in scientific circles and in fiction. [3] [4] [5] A popular one in fiction is that it was caused by an alien spaceship, possibly first put forth in Ed Earl Repp's 1930 short story "The Second Missile".