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AST101H1 Lecture Notes - Lecture 1: Milky Way, Virgo Supercluster, Local Group

Earth is a planet orbiting the sun. Sun is one of 100+ billion stars in milky way galaxy. Our galaxy is one of 70+ galaxies in local group. Local group is one smaller part of local supercluster. Our galaxy contains more than 100 billion stars. Observable universe contains roughly 100 billion galaxies. Universe began in big bang and has been expanding ever since. Big bang produced two chemical elements: hydrogen . Rest was produced by stars and recycled within galaxies from one generation of stars to the next, which is why we are star stuff . Rotates on its axis once each day. We move with our sun in random directions relative to stars in our local solar neighbourhood.

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Which, if any, of the following statements is/are true? 1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster. 2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago. 3)Planets are believed to have formed by a process known asaccretion. 4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei. 6)The name of the second largest object in the Universe is TheSouthern Wall. 7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt. 8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy. 9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri. 10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale. 11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

AST101H1 Lecture Notes - Lecture 1: Milky Way, Virgo Supercluster, Local Group

AST101H1 Full Course Notes

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