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 …

6 hours ago · Here's the latest news you need to know. Comet 3I/ATLAS will approach within 168 million miles (270 million kilometers) of Earth when it makes its close flyby on Dec. 19.

Nov 29, 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 …

1 day ago · The mystifying 3I/ATLAS interstellar comet is blazing toward Earth and will in a matter of days come as close to our planet as it ever will.

1 day ago · On 19 December 2025, interstellar comet 3I/ATLAS will at long last make its closest approach to Earth.

2 days ago · Interstellar comet keeps its distance as it makes its closest approach to Earth This image, provided by NASA, shows the interstellar comet 3I/Atlas captured by the Hubble Space Telescope …

Dec 6, 2025 · A comet is an icy body with a coma and tail. Learn about its structure, composition, orbit, and role in the Solar System.

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 …

May 17, 2025 · When a comet is in the inner Solar System, the Sun warms it up, causing the comet's ice to vaporize and release dust and gas particles. The solar wind blows those particles off the comet, …