CSUSB NSCI 314 - drake equation (67 pages)

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drake equation



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drake equation

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Pages:
67
School:
California State University, San Bernardino
Course:
Nsci 314 - Life in the Cosmos
Life in the Cosmos Documents

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NSCI 314 LIFE IN THE COSMOS 14 EXTRASOLAR PLANETS CONTINUED AND THE DRAKE EQUATION Dr Karen Kolehmainen Department of Physics CSUSB http physics csusb edu karen METHODS FOR DETECTING EXTRASOLAR PLANETS DIRECT OBSERVATION TRANSITS GRAVITATIONAL LENSING ASTROMETRY DOPPLER EFFECT MOST SUCCESSFUL DOPPLER EFFECT A SHIFT IN THE WAVELENGTH OF A WAVE DUE TO RELATIVE MOTION OF THE SOURCE AND THE OBSERVER IF THE SOURCE AND OBSERVER ARE MOVING TOWARDS EACH OTHER THE WAVELENGTH IS SHORTENED IF THE SOURCE AND OBSERVER ARE MOVING AWAY FROM EACH OTHER THE WAVELENGTH IS LENGTHENED THE FASTER THE RELATIVE MOTION THE MORE THE WAVELENGTH CHANGES SEE DEMONSTRATION JAVA APPLET AT http lectureonline cl msu edu mmp applist doppler d htm DOPPLER EFFECT FOR SOUND WAVES A CHANGE IN WAVELENGTH IS A CHANGE IN PITCH THE SOUND IS HIGHER PITCHED IF THE SOURCE AND OBSERVER ARE MOVING TOWARDS EACH OTHER THE SOUND IS LOWER PITCHED IF THE SOURCE AND OBSERVER ARE MOVING AWAY FROM EACH OTHER EXAMPLE SIREN ON A MOVING CAR DOPPLER EFFECT FOR LIGHT WAVES A CHANGE IN WAVELENGTH IS A CHANGE IN COLOR THE LIGHT IS BLUER IF THE SOURCE AND OBSERVER ARE MOVING TOWARDS EACH OTHER BLUESHIFT THE LIGHT IS REDDER IF THE SOURCE AND OBSERVER ARE MOVING AWAY FROM EACH OTHER REDSHIFT EXAMPLE LIGHT COMING FROM DISTANT GALAXIES IS REDSHIFTED DUE TO THE EXPANSION OF THE UNIVERSE STELLAR DOPPLER SHIFT DETECTION Star Moves Toward Observer Unseen Planet Moves Away From Observer LIGHT FROM STAR IS BLUE SHIFTED STELLAR DOPPLER SHIFT DETECTION Unseen Planet Moves Towards Observer Star Moves Away From Observer LIGHT FROM STAR IS RED SHIFTED DOPPLER EFFECT DETECTION OF PLANETS PLANET AND STAR ORBIT AROUND THEIR COMMON CENTER OF MASS SINCE THE STAR IS MUCH HEAVIER IT MOVES IN A SMALLER CIRCLE OR ELLIPSE THE PLANET IS UNSEEN BUT LIGHT FROM STAR IS ALTERNATELY BLUESHIFTED AND REDSHIFTED DUE TO THE MOTION OF STAR CYCLE REPEATS OVER AND OVER AGAIN DOPPLER EFFECT DETECTION OF PLANETS WORKS ONLY IF ORBIT IS SEEN NEARLY EDGE ON EASIEST TO



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