Extrasolar Planet!

1. What are the four ways astronomers can detect extrasolar planets?
2. Choose one of the four ways and explain it in detail.
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.



1. Doppler Shift
Astrometric Measurements
Transit Method
Gravitational Micrlensing
Direct Detection

2.Doppler Shift
Measurement or change in stars. Star's movement induced by a planet's gravitational tug.

3.210 have been discovered.