GG101 Lecture Notes - Lecture 2: Milky Way, Solar Minimum, Solar Wind
Document Summary
Milky way galaxy a latened, disk shaped collecion of stars in the form of a barrel spiral a spiral with a slightly barred or elongated core. Gravity the mutual atracion exerted by every object upon all other objects in proporion to their mass. Planetesimal hypothesis how suns condense from nebular clouds (nebula = large, slowly rotaing and collapsing cloud of dust and gas) Earth"s closest posiion to the sun, which occurs on hemispheres winter. Earth"s farthest posiion from the sun, which occurs on hemispheres summer. Sun is located in the middle of our solar system, but it is not centered, it is slightly ofset to one side, which is the cause of perihelion and aphelion. Fusion the suns abundant hydrogen nuclei are joined together due to high temperatures and deep pressure forming helium. , a solar minimum is a period of years with few sunspots visible and a.
