A satellite will scour the Milky Way for exoplanets orbiting stars just like the sun
After sending robots to the Moon, landing them on Mars and building its own space station, China is now eyeing distant solar systems. This month, scientists will release detailed plans for the country’s first mission to discover exoplanets.
With current technology and telescopes, it is extremely hard to find the signal of small, Earth-like planets when their host stars are one million times heavier and one billion times brighter, says Jessie Christiansen, an astrophysicist at the NASA Exoplanet Science Institute at California Institute of Technology in Pasadena.
The telescopes will look for exoplanets by detecting small changes in a star’s brightness that indicate that a planet has passed in front of it. Using multiple small telescopes together gives scientists a wider field of view than a single, large telescope such as Kepler. Earth 2.0’s 6 telescopes will together stare at about 1.2 million stars across a 500-square-degree patch of sky, which is about 5 times wider than Kepler’s view was. At the same time, Earth 2.
“Our satellite can essentially conduct a census that identifies exoplanets of different sizes, masses and ages. The mission will provide a good collection of exoplanet samples for future research,” he says.
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