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32 Cards in this Set

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  • Back
The geocentric model of the solar system has the planets..
and the moon and sun orbiting Earth.
What does the heliocentric model of the solar system state?
Earth and the other planets orbit the sun.
Who was the first person to propose a heliocentric model of the universe?
Aristarchus.
After the Middle Ages, the astronomer who changed the model of the solar system by placing the sun at it's center was..?
Copernicus.
Which astronomer discovered that the planets orbit the sun in oval-shaped paths called ellipses?
Kepler.
Galileo's most important contribution to astronomy was his...?
Description of the behavior of moving objects.
Issac Newton was the first person to formulate and test the law of...?
Universal gravitation.
The spinning of Earth on its axis is called...?
Rotation.
What is Earth's motion in its path around the sun called?
Revolution.
What is percession?
The slow change in the direction in which Earth's axis tilts.
What causes the moon's phases?
Changes in how much of the sunlit side of the moon faces Earth.
The cycle of the moon through its phases, or the synodic month, is...?
29/2 days long.
A solar eclipse occurs when...?
The moon casts a dark shadow on Earth.
During a total lunar eclipse, the moon...?
Moves into Earth's umbra.
What causes the erosion of rocks on the moon's surface?
Impacts of particles from space.
What is the soil-like layer on the moon's surface called?
Regolith.
Long valleys or trenches associated with maria are...?
Rilles.
Which of the following are NOT present on the moon? A.) light, B.) gravity, C.) atmosphere, D.) heat
Atmosphere.
The most widely accepted model for the origin of the moon involves...?
A large body hitting Earth and ejecting debris that became the moon.
Which of the following lunar features is the oldest? A.) surface regolith, B.) highlands, C.) craters with rays, D.) maria basins
Highlands.
The geocentric model of the solar system was proposed by the astronomers of ancient ______
Greeks.
The planetary system of Ptolemy had the planets moving in circular orbits around ____
Earth.
The ______ motion of planets is when they appear to move eastward among the stars, then stop and reverse direction.
Retrograde.
The Danish astonomer ___ made precise measurements of the locations of bodies in the solar system, especially Mars.
Brahe.
The average distance between Earth and the sun is about _____ million km, or one _________ unit.
150 million km && astronomical
The mass of an object is a measure of the total amount of ____ it contains.
Matter.
The Earth movement that causes night and day is called ______
Rotation.
Earth is closest to the sun on about January 3rd at _____ and is farthest from the sun on about July 4th at _____
Perinelion && Aphelion
Because of ____, the North Star will no longer be Polaris in several thousand years.
Precession.
The moon is closest to Earth at _____ and farthest away at _____
Perigee && apogee.
Bright splash marks that radiate outward from craters for hundreds of kilometers are ______
Rays
Most of the moon's surface is covered by ______, which are densely pitted, lightcolored areas.
Highlands.