4 days ago · Comet 3I/ATLAS, the third interstellar object ever detected, reached its closest point to Earth overnight from Thursday to Friday (Dec. 18 to 19), and it remains in a good viewing position …

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 …

5 days ago · Comet 3I/ATLAS will approach within 168 million miles (270 million kilometers) of Earth when it makes its close flyby on Dec. 19. You can watch comet 3I/ATLAS's flyby live online in a free …

4 days ago · Interstellar comet 3I/ATLAS will make its closest approach to Earth on Friday. New X-ray images could shed light on its composition.

3 days ago · Today is one astronomers, stargazers and alien conspiracy theorists have been waiting for: interstellar comet 3I/ATLAS is as close to Earth as ever.

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 …

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 …

Nov 2, 2025 · A comet is a small, icy body that orbits the Sun and releases gas and dust when heated. Each comet has a frozen nucleus (ice, rock, organic material), a glowing coma that forms as it nears …

Dec 15, 2025 · Discovered over the summer, the comet known as 3I/Atlas will pass within 167 million miles of our planet on Friday. That's as close as it will get on its grand tour of the solar system.

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, …