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Astronomy Chapter 1 Word Scramble

 
 

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Question Answer
geocentrican earth-centered universe
cosmic addressplace of earth in the universe
galaxygreat island of stars in space
Milky Waygalaxy in which our solar system resides
Local Groupa group of galaxies
galaxy clustersgalaxies with more than a few dozen members
super clustera region of tightly packed galaxies
universethe sum total of all matter and energy
expandingaverage distances between galaxies increase with time
Big Bangthe beginning of expansion - 14 billion years ago
nuclear fusionthe process by which atomic nuclei smash together to make a heavier nuclei
supernovatitanic explosion in which a star dies
early universemade up of hydrogen and helium
age of the solar system4.5 billion years
speed of light300,000 km per sec
light yeardistance light travels in a year - 6 trillion miles
brightest starSirius
fact of lightthe farther away we look in distance, the further back we look in time
Orion Nebulaa giant cloud in which stars and planets are forming
Andromeda Galaxyclosest galaxy - 2.5 million light years
age of universe14 billion years
observable universethe portion of the universe that we can observe
definition of planet1) orbits around a star 2) round shape 3) clear neighborhood around orbit
number of starsmore than 100 billion
speed of Earth600 miles per hour
astronomical unitEarth's average orbital distance - 93 million miles
ecliptic planea flat plane defined by the Earth's orbital path
axis tilt23.5 degrees
Polarisname for the North Star
speed of solar system500,000 miles per hour