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Crossword Puzzle

Across
He showed that planets move in a ellipses and speed up when they got closer to the sun
The apparent change in position of an object when seen from different places
The tendency of an object to resist any change in its motion
The farther apart a galaxy is from one another that faster they move away from each other
A model of the solar system in which everything revolves the sun
The spinning motion of a planet on its axis
States every object attracts to each other
A enormously bright, distant galaxy with a giant black hole
The study of the moon, stars and other objects in space
The initial exposition that resulted in the formation and expansion of the universe
The movement of an object around another object
All of space and everything in it
Down
The force that pulls objects toward each other
A regular oval shape trace by a point moving in a plane so that the sum of its distance from two other points
He had evidence for the geocentric model
He put together the geocentric model
One of the small asteroid-like bodies that formed the building blocks of the planets
He showed the force of gravity depends on mass and distance
A model of the solar system in which everything revolves around the earth
The distance that light travels in 1 year, about 9.5 million kilometers
Matter that does not give off electromagnetic radiation but is quite abundant in the universe
A huge group of single stars, star systems, star clusters and gas bound together by gravity
He arranged planets around the sun
The observed planets for 20 years