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the moon ___ falling but it is also moving _____, always ending in a _______ orbit
a spaceship must travel ____ miles from Earth to experience weightlessness because it can be on ____ there
the feeling of weightlessness in space is caused by the fact that the spaceship is ____ _____
if you throw a rock as fast as ___ km/s without air resistance it will ____ the earth _____
keplers 1st law (about orbit) applies to the ____, earth, ____, jupiter, an asteroid, and a comet. but not a ____ ____ _____
moon/venus/solar wind particle
_____ velocity is the speed needed to get an object on an _____ where it ____ returns
if a spaceship is launched from the moon, the slowest speed it would need in order to leave the solar system is ____ km/s
the invention of the ____-_____ _____ made if possible to build rockets that speed was fast enough to orbit the earth
if you were going the fastest speed possible, ___ km/s it would still take _______ ______ to reach the closest star.
Copernicus teaching was the _____ world view that the ____ revolve around the ______
Copernicus _____ the first to say that the earth revolved around the sun, the idea was well known but only ____ believed it
Copernicus' method explained the motion of the planets more ____ but not more ______
the ______ worldview is called that because it says that the center of the world is the ______
Galileo's most important contribution to astronomy was that he used a _____ to _____ the ______
Galileo's discoveries were the most important every made in astronomy because they prove that the _____ and the ______ are not ____ worlds
keplers _____ law states that the _____ of the orbit of the planets is an ______
kepler's ____ law states that a planets _____ from its star (a) is related to its period of _____ (T) and the mass of the star (M) so a(cubed)=MT(squared)
to us, the people in china are _____ _____, they aren't falling because ____ pulls them to the ground
meteor showers have a _____ because meteors are arriving _____ to each other and they seem to diverge due to a _____
we have found _____ that originated in Mars, allowing us to believe that we have rock on Mars
_____ are falling bodies burning in the atmosphere while ______ have reached the ground
it takes a few ____ to see that a ____ is moving, and a few ____ to see a significant progress on its orbit
_____ spend most of their time on the outskirts of the solar system on the outside of _______
a ____ is a large piece of ice with rock frozen in it, also called a ______ ______
the ____ and _____ of a comet are made of rarefied gas that is much _____ than what we would call a vacuum on earth
after a ____ comet visits the sun a few thousand times its ice _____ and the ____ inside is _____
if a ___ hit the earth, there would be extensive _____ especially in that continent where it hit, but there would be no immediate _____ on all of earth
____ planets contain little amounts of hydrogen and helium because the ____ wind blew these materials out of the ____ solar system
Jupiter is so _____ because it is outside of the snowline where light ____ are frozen out
___ and _____ are made of least modified matter, which resembles the "stuff" that the solar system was originally made of
KBOs are much ____ than gas giants because the ________ picked up most of the gas that was blown out from the inner solar system
the stripes and bands of Jupiter are different colors because they are clouds of different _____, temperature, and _____ composition
the clouds of Jupiter are turned into regular patterns and parallel bands and stripes because of ____ _____
the ______ part of earth is a very thin ____ that floats ____ the hot and molten interior
there are no _____ on the moon because it is a small body and it has already cooled off enough to have a ____ _____
the inside of the earth is ____ because it is still ______ and hasn't had enough time to completely _____
the grooves and straight lines on Ganymeade and Europa are caused by ____ erupting from an underground _______
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