Extrasolar Planets

1.) The four ways astronauts can detect extrasolar planets are: Radical Velocity, Astrometry, Transmit Method, and Optical Detection. 2.) I'm going to chose Radical Velocity, it measures slight changes in the position of a star that is tugged towards and away from a planet's gravitational pull. The changes can be detected by measuring the Doppler Effect. When light from a star is moving away from the observer is shifted to the red end of the spectrum, and when the light from a star is moving towards it, it is shifted to the blue end of the spectrum. By measuring the movements of the spectral lines over a period of time, the orbital period of a planet can be determined. 3.)Google says it has detected gas giant planets thought to resemble, Jupiter.