astronomy quiz #1 Flashcards
(50 cards)
What is astronomy?
the study of objects beyond earth’s atmosphere
Who made the Geocentric model?
Ptolemy
describe the geocentric model
the suns, planets and stars orbited the earth
easy way to remember geocentric model
¨Geo¨ = earth centered
Who made the heliocentric model?
copernicus
describe the heliocentric model
the sun is in the center of the universe
easy way to remember the heliocentric model?
¨Helio¨ = sun in greek
what did galileo invent to help him study astronomy?
telescope
What was Keplers contribution to astronomy?
1st law, planets have elliptical orbits
what is eccentricity?
the shape of the planets orbit
what shape is an orbit with high eccentricity?
oval
what shape is an orbit with low eccentricity?
circle
what is perihelion?
point in a planets orbit when closest from the sun
what is aphelion?
point in a planets orbit when further from the sun
what is gravity?
an attractive force between 2 objects
whats gravitys formula?
F=G(m1xm2) /d2
what is mass? can it change?
the measure of amount of matter an object can contain and it doesn’t change
what is weight? can it change?
vertical force exerted by a mass as a result of gravity and it can change
as gravity increases, weight
increases
as gravity decreases, weight
decreases
as gravity increases the height of a jump..
decreases
as gravity decreases the height of a jump..
increases
what is light?
common term for electromagnetic radiation traveling through space a waves
what is the speed of light?
3.0x10>8 m/s
