1. What are the four ways astronomers can detect extrasolar planets?
Doppler Shift, Astrometric Measurement, Transit Method, &nd Gravitational microlensing.
2. Choose one of the four ways and explain it in detail.
Astrometirc Measurement is a method that depends on the slight motion of a star caused by the orbiting planet.
3. In your answer to #2 you chose one way that astronomers detect extrasolar planets. Search the Internet to find how many extrasolar planets have been detected using this method.
210 have been discovered.
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