Backyard stargazers get a monthly guide to the northern hemisphere's skywatching events with "Tonight's Sky." Look for dense star cluster M2, home to 150,000 stars.
"Tonight's Sky" is produced by HubbleSite.org, online home of the Hubble Space Telescope. This is a recurring show, and you can find more episodes — and other astronomy videos — at HubbleSite.org.
Visit Tonight's Sky on HubbleSite.
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