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 …

2 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 …

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 …

2 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.

2 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.

4 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 …

5 days ago · 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.

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 …

5 days ago · A stray comet from another star swings past Earth this week in one last hurrah before racing back toward interstellar space. Discovered over the summer, the comet known as 3I/Atlas will …