A comet discovered last year — known as C/2023 A3 Tsuchinshan-ATLAS — is set to make a close approach to Earth in the coming days.
The snowy dirtball is nearly 2 miles in diameter and its tail of dust and gasses extends for tens of millions of miles, Bill Cooke, lead of NASA's Meteoroid Environment Office at the Marshall Space Flight Center in Huntsville, Alabama, told NPR.