How can astronomers know that distant planets exist if they are too far away to see?

1 Answer
chandramohanPanakkal
Jul 18, 2016

Planets orbit stars in elliptical orbits.

Explanation:

When they are near to star it causes a small wobbling motion on the star.By studying this change in position astronomers can estimate rthe size of planet When a planet crosses the disk of star, a small drop in light is observed,. THis dip and its timings will tell astronomers the size of planet and its orbital period. This is known as transit method This is how the Kepler space telescope found out about 2500 exo planets.enter image source here .
picture credit picture about space.com.

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