The launch of the Kepler spacecraft from Cape Canaveral in Florida marked the beginning of the most ambitious hunt for planets like ours in distant solar systems.
The Kepler telescope will spend three-and-a-half years staring deep into a starry region of the Milky Way, in the direction of the constellations Cygnus and Lyra, in the hope of spotting Earth-sized planets as they pass in front of their stars.
Every half hour, Kepler will record the brightness of 100,000 stars using a 95 megapixel camera built by the British firm e2v. The camera is so sensitive, it could spot the imperceptible dimming of a car headlight as a fly wanders across it.
The mission will focus its attention on planets in the "Goldilocks region" of space, where conditions are just right for liquid water to exist. Some of these worlds could potentially be home to life as we know it.
"If Kepler were to look down at a small town on Earth at night from space, it would be able to detect the dimming of a porch light as somebody passed in front," said James Fanson, project manager at Nasa's Jet Propulsion Laboratory in California.
Though the Kepler mission should reveal Earth-sized planets in habitable orbits around stars, it will not be able to tell us if they are home to alien life. For that, we will have to wait for future missions that can analyse the atmospheres of the alien worlds Kepler finds.
The Kepler telescope will spend three-and-a-half years staring deep into a starry region of the Milky Way, in the direction of the constellations Cygnus and Lyra, in the hope of spotting Earth-sized planets as they pass in front of their stars.
Every half hour, Kepler will record the brightness of 100,000 stars using a 95 megapixel camera built by the British firm e2v. The camera is so sensitive, it could spot the imperceptible dimming of a car headlight as a fly wanders across it.
The mission will focus its attention on planets in the "Goldilocks region" of space, where conditions are just right for liquid water to exist. Some of these worlds could potentially be home to life as we know it.
"If Kepler were to look down at a small town on Earth at night from space, it would be able to detect the dimming of a porch light as somebody passed in front," said James Fanson, project manager at Nasa's Jet Propulsion Laboratory in California.
Though the Kepler mission should reveal Earth-sized planets in habitable orbits around stars, it will not be able to tell us if they are home to alien life. For that, we will have to wait for future missions that can analyse the atmospheres of the alien worlds Kepler finds.
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