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.

Prepare to spot a rare, bright comet. The space rock is slinging toward Earth from the outer reaches of the solar system and will make its closest pass on Saturday. It should be visible through the end of October,

A Calgary professor says a special comet may be visible to the naked eye right here in Calgary later this week — if you miss it, you might not be able to see it again for another 80,000 years.