These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of …

Dec 24, 2025 · 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 …

Dec 3, 2025 · When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away …

Dec 22, 2025 · From jaw-dropping astrophotography to close brushes with the sun and a savage break up. here's six events that made 2025 the year of the comet.

Aug 26, 2025 · Simply put, a comet is a large body of ice and dust orbiting the Sun, sometimes seen as a bright object in the sky with a long tail streaming behind it. Wanderers of the Solar System, comets …

Dec 19, 2025 · Live Science brings you the latest comet news, features and articles as astronomers track these extraordinary objects.

Apr 24, 2025 · Each comet has a frozen part, called a nucleus, often a few miles across. The nucleus contains icy chunks, frozen gases with bits of embedded dust. A comet warms up as it nears the Sun …