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5 Ιαν 2023 · Great comets are fixtures throughout astronomical history. They pop up unexpectedly and can change the way people see the skies, creating unforgettable experiences that can inspire and live on in...
Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices. They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet.
Scientists have long wanted to study comets in some detail, tantalized by the few 1986 images of comet Halley's nucleus. NASA's Deep Space 1 spacecraft flew by comet Borrelly in 2001 and photographed its nucleus, which is about 5 miles (8 kilometers) long.
25 Σεπ 2019 · Shortly after its launch in 2021, NASA’s James Webb Space Telescope will observe three different types of comets in infrared light, which is invisible to human eyes. By learning more about comets, scientists can gain new insights into what the solar system was like billions of years ago.
31 Ιουλ 2023 · Learn more about the life of a comet with this short animation from the European Space Agency (ESA). Explore current and previous comet missions in more detail with NASA.
16 Οκτ 2023 · A quick and easy guide to comets, including what they are made of, where they come from and why their tails are so long.
Early rock carvings resembling comets have been found in Scotland dating back to the second millennium BC, and a comet-like shape found on rock carvings in Val Camonica, Italy, dates to the late Iron Age.
