The Spitzer Space Telescope is celebrating 15 years of discoveries, including exoplanets, distant galaxies and even a new ring around Saturn.
NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.
Lori Dajose
From October 16–22, Caltech and nine other institutions are participating in Pasadena Astronomy Week to celebrate the city's rich history in astronomy.
Using data from NASA's Kepler spacecraft, scientists have confirmed 104 planets outside of our solar system.
How do some gas giant planets end up so feverishly close to their stars? NASA's Spitzer Space Telescope finds new clues.
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