All year long as Earth revolves around the sun, it passes through streams of cosmic debris. The resulting meteor showers can light up night skies from dawn to dusk, and if youre lucky you might be able to catch one.
If you spot a meteor shower, what youre really seeing is the leftovers of icy comets crashing into Earths atmosphere. Comets are sort of like dirty snowballs:As they travel through the solar system, they leave behind a dusty trail of rocks and ice that lingers in space long after they leave. When Earth passes through these cascades of comet waste, the bits of debris which can be as small as grains of sand pierce the sky at such speeds that they burst, creating a celestial fireworks display.
A general rule of thumb with meteor showers:You are never watching the Earth cross into remnants from a comets most recent orbit. Instead, the burning bits come from the previous pass. For example, during the Perseid meteor shower you are seeing meteors ejected from when its parent comet, Comet Swift-Tuttle, visited in 1862 or earlier, not from its most recent pass in 1992.
Thats because it takes time for debris from a comets orbit to drift into a position where it intersects with Earths orbit, according toBill Cooke, an astronomer with NASAs Meteoroid Environment Office, who spoke toThe New YorkTimeslast year.
The name attached to a meteor shower is usually tied to the constellation in the sky from which they seem to originate, known as their radiant. For instance, the Orionid meteor shower can be found in the sky when stargazers have a good view of the Orion constellation.
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Meteor Showers in 2017 That Will Light Up Night Skies - New York Times
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