The origin of the name Orion meteor shower

Halley's comet is composed of ice and dust. Its core diameter is slightly larger than 10 km, and its weight is10,000,000,000 tons. It orbits the sun once every 76 years, and every time it approaches the sun, it will lose 2 billion tons of substances, in which ice sublimates into water vapor and dust particles fly in all directions. These countless particles are still moving rapidly along the orbit of Halley's comet. Halley's comet has a very flat orbit, with the perihelion outside Neptune's orbit and the perihelion in Venus's orbit. The earth passes through the orbit of Halley's Comet twice a year, one of which is at 65438+ 10, 16 to 27. During this period, many dust particles will enter the earth's atmosphere. You can't see anything flying in during the day. Although they come in parallel at night, according to the perspective principle (parallel lines converge at one point in the distance), these meteors seem to scatter in all directions from the same point in the sky, which is called "radiation point". Every year from June 5438 to 10, the radiant point of meteor shower happens to be in Orion, so it is named Orion meteor shower.