AST101H1.docx

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Winter

Description
1 light year10 trillion km The universe is 137 billion years old Stars hot gas produce energy by nuclear fusion Galaxy orbiting the same center Milky Galaxy Way 100000 light year Andromeda 2000000 years to reach us Galaxy clusters are moving apart from one another Center of mass always leans to the object with greater mass Keplers lawsNewtons laws Remain the same until another external force Force massacceleration Fgravity Freefallonly gravity Orbital shapeeccentriccircular Lightelectromagnetic radiation Speedwavelength redfrequency blue Gamma rayXrayUVVisibleinfraredradio ShorterWavelength Low density gasemission Spectral lineschemical compositions Dense objects emit light at all wave
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