Lab 10 - Physics & Astronomy

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Hubble’s Law• Hubble Measured distances tonearby galaxies using Cepheidvariables• Other astronomers measuredgalaxy velocities (redshifts)Hubble DiagramRedshifts

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Hubble’s Law• Hubble Measured distances tonearby galaxies using Cepheidvariables• Other astronomers measuredgalaxy velocities (redshifts)Hubble DiagramRedshifts

Recessional Velocity is Proportional to Distance10 Mpc 20 Mpc 30 Mpc 40 MpcMilkyWay A B C1400700V = 0 70014002100 2800km/sec40 Mpc30 Mpc20 Mpc 10 Mpc Alien’sGalaxyMilkyWay A B C10 Mpc 20 Mpc2800 2100 1400700V = 07001400km/secThe Universe is Expanding!!

Page 1 and 2: Astronomy 105 LaboratoryLAB 10
Page 3: Edwin Hubble(1889-1953)• Measured
Page 7 and 8: Finding a Galaxy’s DistanceHubble
Page 9 and 10: Example: H o = 60 km/s/Mpct1Ho160 k
Page 11 and 12: d 15.6 Mpc 49.4 mmS Sample Galaxie
Page 13 and 14: Measuring Recessional VelocityH lin
Page 15: END

Lab 10 - Physics & Astronomy

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