moon earth science test Flashcards
what was 2 reasons how people realize that the earth was round
because the shadow on a lunar eclipse showed some roundness. Also people saw the mast of a ship first in the distance then the ship.
where would you look for the norht star if you were in the north pole
straight up. the more norht you go the more up you look
how did erastothenes find the circumfernece of earth
he did some calculations using how far a camel walked in a day
what were the ancient systems of the galaxy
geocentric, and heliocentric
what did Ptolemy say about the movements of the earth/ planets
not only are they moving around the sun. they themselves are rotating.
what is it called when a planet goes around the sun.
And when it just goes in circles
revolution, rotation.
what did copernicus say about the solar system.
the sun is the center of the solar system not the universe.
what did brahe do.
he did lots of precise measurements and persuaded the king to build an observatory
what are keplers three laws
Elliptical orbi not circle.
Sun center of gravity is offset from
Planets closer to the sun travel faster.
what did galileo find out about jupiter.
it had moons going around it and not just only earth.
galileo why do the phases of venus exist
because its closer to the sun than us and we can see different portions of it glowing as it goes around the sun
what did galileo find out about the sun and moon. were they perfect?
no they had blemishes. the sun hap sunspots that took about a month to stop. and the moon had craters everywhere. so it wasnt a perfect sphere
what were the basic laws of gravity
the larger the object the more gravity it has. the farther apart the less gravity it has.
what does the law of inertia say
an object in motion will stay in motion. not in motion will not go until moved.
what keeps us in orbit
inertia and gravity are in perfect balance which keeps us in orbit
