- Former astronaut John Grunsfeld, associate administrator for NASA's Science Mission Directorate, shared Stofan's optimism, predicting that signs of life will be found relatively soon both in our own solar system and beyond.
- Recent discoveries suggest that the solar system and broader Milky Way galaxy teem with environments that could support life. For example, oceans of liquid water slosh are believed to exist beneath the icy shells of the Jupiter moons Europa and Ganymede, as well as that of the Saturn satellite Enceladus.
- Farther afield, observations by NASA's Kepler space telescope suggest that nearly every star in the sky hosts planets — and many of these worlds may be habitable. Indeed, Kepler's work has shown that rocky worlds like Earth and Mars are probably more common throughout the galaxy than gas giants such as Saturn and Jupiter.
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