1. What are the four ways astronomers can detect extrasolar planets?
Radial Velcoity, Astrometry, Opitcal Detection, and Transit Method
2. Choose one of the four ways and explain it in detail.
Radial Velcoity is also known as Doppler spectroscopy, this method measures slight position of a star that happen as it is tugged to and fro by a planets gravitational pull
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.
They have not given a answer but a vast amount
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