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Science Quiz 5/25/11

Who is Ptolemy? What did he do? Egyptian astronomer, came up with geocentric model, ancient greeks agreed
Who is Galileo Galilei? What did he do? Italian scientist,proved heliocentric model using a telescope
Who is Nicolaus Copernicus? What did he do? Polish scientist,revived heliocentric model
Who is Johannes Kepler? What did he do? German mathematician, discovered orbit of a planet around sun is an ellipse (oval)
Heliocentric model Sun is in the middle, earth and planets revolve around it
Geocentric model Earth is in the middle, sun and the planets revolve around it
Ellipse Oval shaped, shape of orbit of a planet around the sun
Space-probes Unpiloted vehicle, carries scientific instruments into space & transmits information back to earth
Spacesuit Allows people to live in space
Spaceshuttle Reusable space vehicle that is launched like a rocket & lands like an airplane
Spacestation Permanent lab designed for research in space
Satellite Have a clear view of space, fly high in space
Au Astronomical Unit, measures distance from earth to sun
Mercury 0.4 au
Earth 1.0 au
Venus 0.7 au
Mars 1.5 au
Jupiter 5 au
Saturn 9.5 au
Uranus 19 au
Neptune 30 au
Pluto 40 au
Gravity The attraction between any 2 objects because of their masses, keeps planets in air
Inertia The tendancy of an object to resist a change in its motion, makes planets go in straight line
Moon Always see same side of the moon,low gravity, variations in temp., water in poles
Spring tide Need moon in a node, full & new moons, change between high and low tides is the greatest
Neap tide Need moon in a node, 1st and 3rd quarter moons, change between high and low tides is the least
Lunar eclipse Sun, earth and moon...occurs when earth casts a shadow on the moon
Solar eclipse Sun, moon and earth...occurs when moon casts shadow on portion of earth, large umbra
Solar nebula Large thin cloud of dust and gas
Planetesimal's Asteroid-like bodies that collided to form planets (accretion)
Protoplanetary disk Large disk cloud of dust and gas
Protoplanets Moon sized planetesimals
Created by: NATWEST