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Universe
Mr. SkirbstPhysical Science
Topic 24
Watch Videos:VIDEO: The UniverseCLIP: Understanding the UniverseCLIP: Early Theories about the UniverseCLIP: Matter & Energy
UniverseBig Bang Theory
- the belief that the universe began with an explosion from a single point containing all the matter of the present universe
UniverseBig Bang Theory
- states that the universe is currently expanding in all directions
UniverseDoppler Effect
- apparent change in wavelength due to the movement of an object
http://astro.unl.edu/classaction/animations/light/dopplershift.html
Doppler EffectRed Shift
- spectrum shifted to red- indicates movement AWAY from an observer
Doppler EffectBlue Shift
- spectrum shifted to blue- indicates movement TOWARD an observer
Features of the UniverseConstellations
- groups of stars that appear to form patterns in the sky
Features of the UniverseGalaxies
- major feature of the universe- huge collection of billions of stars
3 Types of Galaxies1. Spiral
- shaped like a pinwheel
You are here!
3 Types of Galaxies2. Elliptical
- varies from spherical to disk-like
3 Types of Galaxies3. Irregular
- no definite shape
Gravity- Force holding galaxies together- Matter “clumped” together by
gravity
Calculating Gravity
G = 4 pi2 L / T2
pi = 3.14L = .5mT = 1.4 sec
where:
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