To determine stars' physical traits, Kepler sees the light

Brightness measurements can help gauge size, stage of evolution

By Andrew Grant, 09:52 AM August 22, 2013

The key to learning about distant stars is as simple as watching them flicker.

Stellar brightness measurements from NASA’s planet-hunting Kepler space telescope can pin down the once-elusive physical properties of about 170,000 stars and the planets orbiting them, scientists report in the Aug. 22 Nature. The new technique can translate modest fluctuations in starlight over several hours into a star’s size, surface gravity and stage of life.

“All this information is encoded in a star’s brightne...

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