universe - anything that exists, especially in space, telescope - an instrument used to see objects that are far away , galaxy - a large group of stars bound together by gravity , spiral galaxy , irregular galaxy, eliptical galaxy, asteroid - a small rocky object that orbits the sun, comet - a clump of frozen gases, ice, dust and rock that orbits the sun, meteor - any space rock that produces a streak of light in the night sky (a meteroid that has entered earth's atmosphere), meteorite - a meteor that passes through earth's atmosphere and lands on Earth , meteoroid - space rocks made mostly of iron , nebula - a cloud of dust and gas from which stars are born , nuclear fusion - the process by which atomic nuclei in stars are fused and elecronmagnetic radiation is released, including light and heat, solar system - the sun and all the objects in orbit around it, spectroscope - an instrument for forming and examining the spectra from light sources, supernova - the tremendous explosion of a star, white dwarf - the core of a dying star, left behind after nuclear fuel has been exhausted, NASA - the agency of the United States government that explores space, STEM - the related subjects of science, technology, engineering and mathematics, Big Bang Theory  - the theory proposes that about 13.7 billion years ago, the universe started from a single point, cyclic model - big bang was not the beginning, but simply a moment that will occur again many years from now., geocentric model - Earth is at the center of the universe and all objects revolve around Earth, heliocentric - the sun is at the center of the universe and the planets/other objects revolve around the sun, steady state theory  - the denisty of the universe never changes , spectrum - blend of colors, amplitude - the strength of a wave, measured on a wave diagram as the height of a crest or depth of a trough compared to the center line, electronmagnetic spectrum  - the full range of electronmagnetic waves, organized by wavelength or frequency, electromagnetic waves - type of waves that form and travel as electric waves and magnetic waves, frequency - the number of wave units that repeat in a certain amount of time, transverse waves - a type of wave in which the vibrations form a right angle to the wave direction ,

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