AST101H1 Lecture : chapter 1

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sangriareindeer116

16 Feb 2011

School

UTSG

Department

Astronomy & Astrophysics

Course

AST101H1

Professor

Clifford Orwin

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AST101H1 Full Course Notes

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Document Summary

Geocentric - cannot feel the constant motion of earth as it rotates on its axis and orbits the sun. Cosmic address - our place in the universe. Solar system (e. g earth) - consist of the sun and all the objects that orbit it (planets, their moons and smaller objects including rocky asteroids and icy comets). Milky way galaxy - disk shaped collection of stars (100 billion stars) 1 of the 2 largest among the 40 galaxies in the local group. Galaxy - island of stars (few 100 million to trillion or more stars) Galaxy clusters - galaxies with more than a few dozen members (very dense) Arranged in giant chains with huge voids between them. Superclusters - area where galaxies and galaxy cluster are most tightly packed. Asteroid - small rocky object that orbits a star. Part of a category called small solar system bodies . Comet - small ice rich object that orbits a star.

Related Questions

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.

Suppose a solar system, with three planets circling a star, exists in a galaxy far far away. One of the planets orbits the star with the period of 6.31 x 10^7 seconds/cycle and a radius of 3.00 x 10^11 m. It has a moon that orbits it with a period of 1.73 x 10^6 seconds/cycle at a radius of 6.00 x 10^8 m.

a) What is the mass of the planet's star?

b) What is the mass of the planet?

c) What is the speed of the planet's moon?