AST101H1 Chapter Notes - Chapter 13.1-13.2: Gravitational Lens, Orbital Speed, Doppler Spectroscopy

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Glare of scattered starlight - hard to see other small spots of planetary light. Obtaining images or spectra of the objects themselves. Inferring existence or properties without actually seeing the objects under study. Observing motion of star to detect subtle gravitational effects of orbiting planets. Observing changes to a star"s brightness that occur when one of its planets passes in front of the star as viewed from earth. Observing stars to detect motion that can be attributed to gravitational tugs from orbiting planes. Each planet has gravitational tug on sun - affects sun"s orbit. Precise measurements of stellar positions in the sky to look for slight motion caused by orbiting planets. Farther planet = smaller side-to-side movement we can observe. Longer the father the planet is from the star. Measure changes in velocity toward / away caused by orbiting planets.