Exoplanets are difficult to detect with a telescope. Glare from the star obscures the view of orbiting planets. Astronomers look for exoplanets indirectly by observing effects on their stars. One common indirect method of detection is Doppler spectroscopy. This method is also known as the radial velocity or wobble method. A star with orbiting planets does not have a perfect orbit because the planets pull on the star. The star's orbit is off-center and makes the star look like it is wobbling.
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