1. Four ways that atsronomers can detect extrasolar planes are Radial Velocity, Astrometry, Transit Method, and Optical Detection.
2. The one I choose is Transit Method. This method explains that when a planet passes a star and its observers line of sight, part of the star will be blocked by the planet. This reduces the star apparent brightness. Highly sensitive detectors would detect that change in brightness thus knowing theres a planet nearby.
3. More than 1o planet have be detected using this method.
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