One year ago, astronomers announced the discovery that seven roughly Earth-sized worlds orbited around the nearby star TRAPPIST-1. Now a year later, additional data have refined our understanding of these planets.We now know more about the TRAPPIST-1 system than any other solar system other than our own.

Hidden Universe: NASA's Spitzer Space Telescope

Homes Away From Home? Revisiting the Seven Planets of TRAPPIST-1

This video series (formatted for standard definition portable players) showcases some of the most exciting discoveries in infrared astronomy from NASA's Spitzer Space Telescope. Looking beyond the visible spectrum of light, Spitzer can see a whole new universe of dust and stars hidden from our Earth-bound eyes. Spitzer is the infrared component of NASA's Great Observatories program, which also includes Hubble (visible), Chandra (x-ray), and Compton (gamma ray). This series is also available in high definition. For high-resolution viewing on your Apple TV or high-res monitor search for the companion 'Hidden Universe HD' feed, also available on iTunes.

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Hidden Universe: NASA's Spitzer Space Telescope