AST101H1 : AST101H1.docx

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Michael Reid

Document Summary

Stars: hot gas, produce energy by nuclear fusion. Galaxy clusters are moving apart from one another. Center of mass always leans to the object with greater mass. Dense objects emit light at all wavelength-continuous-blackbody spectrum. Ground based telescopes use adaptive optics to cancel out the wobbliness -laser guide star and mirror. Sun produces energy by fusing(only in the core) hydrogen nuclei in the proton-proton chain. Proton-proton produce: nutrinos, protons, energy, gamma rays, positrons. Antimatter (measure in interact with other matter via the weak and gravitational forces-no. Luminosity-the amount of energy something produces every second watt)-brightness intrinsically. Apparent brightness- how bright it appears to you. A star"s surface temperature determines the amount of light it emits. White dwarf-no larger size than earth but similar mass with sun. When a star contracts in size, gravitational potential energy converts to thermal energy. Sunspot cycle-disrupt radio communications and knock out sensitive electronic equipment. For a higher temperature object, graph peaks at shorter wavelength.