Pluto’s classification as a “dwarf planet” came as a shock to some, but in reality our understanding of Pluto has always been in flux. Pluto is a tiny, distant, icy object, difficult to see even with Hubble’s vision. Join a Hubble astrophysicist as we explore our history with Pluto, from its discovery to the excitement over the upcoming visit by the New Horizons space probe, in Hubble’s Universe Unfiltered.... Read More

Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky.” In December, a lunar eclipse turns the Moon a festive holiday red. Perseus wanders the night. And binoculars reveal the Double Cluster, a lovely pair of star clusters. “Tonight’s Sky” is produced by HubbleSite, 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.... Read More