Interstellar comet 3I/ATLAS nears closest approach to Earth this Friday

Interstellar comet 3I/ATLAS, the third confirmed object from outside our solar system to visit the inner planets, will reach its closest point to Earth on Friday, December 19, at a safe distance of about 167 million miles (1.8 astronomical units). An astronomical unit, or AU, is the average distance between Earth and the Sun—approximately 93 […]