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Are we alone?
Are we alone? This question is as old as humankind itself. For millennia, people have turned their eyes to the stars and wondered if there are others like themselves out there. Does life, be it similar to our own or not, exist elsewhere in our Solar System? Our Galaxy? Until 1992, when the first exoplanet was confirmed, it was uncertain whether there were even any planets outside those in our own Solar System. Today we know of over 3850 planets around other stars and thousands of planet candidates. Do any of these planets have conditions that would support life? What conditions favor the formation of terrestrial-class planets in developing planetary systems? NASA can help address these questions by developing missions designed to find and characterize extrasolar planetary systems.
Before we can determine if other planetary systems are capable of supporting life, we must first find them. NASA Science pursues this goal by supporting a focused suite of ground-based observations through the Kepler mission, a now-retired space-based observatory that studied the prevalence (how many there are per star) of extrasolar planets, and through the operation of TESS (Transiting Exoplanet Survey Satellite) which is performing an all-sky survey to discover transiting exoplanet ranging from Earth-sized to gas giants.
Legendary astronomer and science educator Carl Sagan was a firm believer that the cosmos is full of intelligent beings. He even more vehemently valued scientific reason and evidence and was known to say that extraordinary claims—even if they support your most wished-for dreams—require extraordinary evidence. Given his brand of skepticism, one would hope he would be pleased about the latest tools we’ve built to determine if we are alone. In the 1997 film Contact, based on the 1985 science-fiction novel written by Sagan about the discovery of an extraterrestrial radio signal, the main character, astronomer Ellie Arroway, says, “The universe is a pretty big place … so if it’s just us, it seems like an awful waste of space.”
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