3I/ATLAS has now made its closest approach to the sun and Earth and is now heading back out toward the outer solar system.

Interstellar comet 3I/ATLAS was discovered on July 1, 2025, by the NASA-funded ATLAS survey (Asteroid Terrestrial-impact Last Alert System) in Chile, a network of telescopes that scans the entire sky ...

As such, the interstellar invader won't be visible to the naked eye, though a 12-inch (30 centimeter) telescope may allow you to spot it as a point of light travelling through a patch of sky below the...