ASTR 1101 Chapter : Astr Lec 2
Document Summary
Exoplanet was found in this system, closest exoplanet to our universe, is believed to be terrestrial and is in the habitable zone. Because is it so close to the star only one face of the planet faces the star so one side would get no light. We could theoretically send a probe to it. Habitable zone- liquid water could exist, close enough/far away from star to have proper heat. The milky way has about 100 billion stars. The distance between the sun and the earths orbit. The mily way is one of about 100 billion galazies. There are as many and more stars as grains of dry sand on all of the earth"s beaches. With the big bang the universe began to expand. As the matter from the explosion began to cool off things started to coalesce in atoms such as hydrogen, helium, and lithium etc.
