Get ready to look up for the year’s biggest and brightest supermoon. And it's pairing up with a comet for a rare stargazing two-for-one.

October's supermoon, known as the "Hunter's Moon," will be the biggest and brightest full moon of the year. Why it matters: The third of this year's four consecutive supermoons arrives during an active month of skywatching between rare northern lights sightings and the once-in-a-lifetime comet.