A hand-sized patch of sky holds billions of hidden worlds
In short: NASA's Kepler telescope is designed to stare at a tiny sliver of the cosmos—roughly the size of a human hand held at arm’s length. Within this small window, it seeks to identify Earth-sized planets orbiting distant suns, searching for the chemical signatures of life.
The Kepler mission targets a specific region in the Cygnus-Lyra constellations, situated above the plane of our galaxy. This 100-square-degree patch contains an estimated 4.5 million Milky Way stars. While the area seems small, it is dense enough to allow for a massive survey: Kepler was designed to monitor about 100,000 sun-like main-sequence stars over a three-and-a-half-year period.
To find these worlds, Kepler utilizes a 95-megapixel camera—the largest ever launched into space at the time of its deployment. The telescope looks for 'transits,' which are periodic dips in a star's brightness caused by a planet passing between the star and the observer. Because Earth only dims our Sun by about 80 parts per million, Kepler’s sensors must be incredibly sensitive, capable of detecting changes as small as 20 parts per million.
This precision allows scientists to identify planets in 'habitable zones,' where temperatures might permit liquid water to exist on a planet's surface. By comparing its long-term gaze to other instruments like the French-built Corot telescope—which can only observe a patch for 150 days and thus only detect planets with orbits of 50 days or less—Kepler provides the endurance necessary to find true Earth twins.
The mission has already revolutionized our understanding of the cosmos. During its nine-year tenure, including its extended K2 phase, it proved that our night sky contains more planets than stars. It successfully identified complex systems, such as Kepler-11, a yellow dwarf star 2,000 light years away orbited by six planets ranging in size from Earth-like to those comparable to Uranus and Neptune.
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Sources
- Summary by Intellect · source: Kepler Captures First Views of Planet Hunting Territory
- Also: Kepler gets first glimpse of its planetary hunting ground | New Scientist
- Also: Kepler / K2 - NASA Science
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