Astrophysics Ib Notes

Topics: Sun, Star, Apparent magnitude Pages: 24 (5551 words) Published: February 20, 2013
13; Astrophysics
Assessment Statements

|E.1.1 |Outline the general structure of the solar system | | |E.1.2 |Distinguish between a stellar cluster and a constellation | | |E.1.3 |Define a light year | | |E.1.4 |Compare the relative distances between stars within a galaxy and between galaxies, in terms of order of magnitude | | |E.1.5 |Describe the apparent motion of the stars/ constellations over a period of a night and over a period of a year and explain| | | |these observations in terms of the rotation and revolution of the Earth | |

E.1.1
Planets orbit the Sun in ellipses and moons orbit planets.

|Planet |Mass Relative to Earth |Radius Relative to the Earth |Mean distance from the Sun (AU) | |Mercury |0.06 |0.38 |0.39 | |Venus |0.81 |0.97 |0.72 | |Earth |1 |1 |1 | |Mars |0.11 |0.53 |1.52 | |Jupiter |318 |11.2 |5.2 | |Saturn |92 |9.5 |9.54 | |Uranus |12.5 |3.7 |19.2 | |Neptune |17.1 |3.5 |30 |

|Galaxy |Giant assemblies of stars, gas, and dust held together by the gravitational forces they have on each other. | | |Our Galaxy is called the Milky Way. | | |Groups of stars | | |Collection of stars including the sun | | |Milky way contains about 1 billion stars | |Asteroid |Small minor planet that drifts in the solar system, orbiting the sun. | |Comet |Gravitationally bound system of galaxies/stars. | | |Mixtures of rock and ice moving in highly elliptical orbits around the sun. | | |As it is approaching the sun, ice melts. Leaving a bright trial of debris which can be millions of kilometre | | |long, pointing away from the Sun. | |Nebulae |From the Latin word for 'cloud'. Used to label all sorts of stuff in...
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