In the last couple of years, a number of planets have been discovered around nearby stars. Planets can be discovered by different means:
Direct detection: the planet is actually seen.
Indirect detection: the planet's existence is inferred from the observed motion of its parent star by observing the doppler shift of spectral lines or by seeing the star wobble around a center of mass.
The second method of discovery is much easier than the first - though both are TOUGH.
Different techniques for detection have produced discoveries at different wavelengths:
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