A ”once in a lifetime” comet is expected to light up the night sky as it passes by Earth later this week. Comet Tsuchinshan-ATLAS will be bright enough to view by the naked eye for most of October. Here’s how to make sure you don’t miss the rare sighting.

A rare celestial event is lighting up the night sky this month as Comet Tsuchinshan-Atlas makes its closest approach to Earth for the first time in roughly 80,000 years.

Atlas comet is still in the neighborhood and will wow stargazers in the North Hemisphere after making an appearance in the Southern Hemisphere over the weekend.