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Why do astronomers find it difficult to locate extrasolar planets with telescopes?

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May 29, 2017

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Ground based telescope can not detect planet in the brightness of Star.

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The central star is several million times bright than the planet..So to detect a planet from ground based telescope is very difficult.
Out of 3000 exoplantes now found 95% were found by Kepler space telescope which is specially designed to detect planet by transit method..Another method is to measure the wobbling of star when the planet comes near the star.

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