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History of Universe

constellation star pattern that appears to form images
refracting telescope uses double convex lenses to collect light and magnify an image
reflecting telescope uses a concave mirror to collect light and a lens to magnify an image
radio telescope collects and magnifies radio waves
light-year distance light travels in one year---about 9.5 trillion kilometers.
spectroscope device that disperses light into its component wavelengths, using a prism or diffraction grating
giant late star in a star's life cycle that occurs when its hydrogen fuel is depleted, its core contracts, and its outer layers expand and cool
white dwarf giant star that has lost its outer layers, leaving behind a hot, dense core that continues to contract under gravity
solar mass The mass of the sun
photosphere light-emitting surface of the sun
sunspots cool, darker areas of the Sun's photosphere
galaxy large group of stars, gas, and dust held together by gravity
milky way Contains 400 billion stars including the sun
local group Our Milky Way galaxy belongs to a cluster called the Local Group
cosmology The study of the universe- how it began, how it evolves, and what it is made of
big bang theory Theory that the universe started with a big bang, or explosion, and has been expanding ever since
dark matter unseen mass that adds to the gravity of a galaxy, but cannot be detected or seen
dark energy energy that might be causing accelerated expansion of the universe
Created by: tguay