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A comet was mentioned in the Anglo-Saxon Chronicle that allegedly made an appearance in 729 BCE. The word comet derives from the Old English cometa from the Latin comēta or comētēs. That, in turn, is a romanization of the Greek κομήτης 'wearing long hair', and the Oxford English Dictionary notes that the term (ἀστὴρ) κομήτης already meant 'long-haired star, comet' in ...
Comet 3I/ATLAS is the third known object from outside our solar system to be discovered. Astronomers have categorized this object as interstellar because of the hyperbolic shape of its orbital path.
Learn about the brightest comets observable from the Earth in 2025. Some of them might become easily visible through binoculars!
Comet, a small body orbiting the Sun with a substantial fraction of its composition made up of volatile ices. Comets are among the most-spectacular objects in the sky, with their bright glowing comae and their long tails. Comets can appear at random from any direction as they move in eccentric orbits around the Sun.
Comets are our cosmic time capsules and can reveal a lot about the early solar system.
Learn what comets are, how they form, and how to observe them in the sky. Comets are icy balls of gas, dust and rock that orbit the sun and have tails that point away from it.
Comet C/2023 A3 is a bright morning object in September and October, visible with the naked eye in Australia and Aotearoa New Zealand. It will pass between Earth and the Sun on October 9 and 10, and could become visible in the daylight sky or grow a long tail.
A quick and easy guide to comets, including what they are made of, where they come from and why their tails are so long.
This is a key place to begin looking for useful and accurate information regarding news, observations, orbital data, designations and names, and good links regarding comets and related topics [sponsored by the International Comet Quarterly (ICQ)].
Learn what comets are, how they are formed, and how they are named. Discover some famous comets and their orbits, tails, and interactions with the Sun and planets.