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spacekibby

TermDefinition
astronomy the study of the universe
year the time it takes for the earth to revolve around the sun
month the time it takes for the moon to revolve/rotate around the earth
day the time it takes for the earth to rotate once
telescope an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
refracting telescope a telescope that uses a set of lenses to gather and focus light from distance objects
reflecting telescope a telescope that uses a curved mirror to gather and focus light from distant objects
electromagnetic specturm all of the frequencies/ wavelengths of electromagnetic radiation
constellation s region of the sky that contains a recognizable star pattern and that is used to describe the location of objects in space
Zenith the point in the sky directly above an observer on Earth
altitude the angle between the object in the sky and the horizon
horizon the line where the sky and the earth appear to meet
light year the distance that light travels in one year, about 9.46 trillion km
Ptolemy He lived 2000 years ago, came up with the theory that the earth is the center of the universe
Copernicus He lived around 1540, he came up with the theory that the sun is the center of the universe.
Tycho Brahe He lived in the late 1500's,he was one of the first astronomers who wrote down very detailed observations. He came up with the theory that the earth is the center of the universe, but the planets went around the sun which revolved around the earth.
Johannes Kepler He lived in the late 1500's, he was an apprentice of another astronomer. He used his mentor's data and observations to create the 3 laws of planatary motion.
Galileo He lived around 1600, he was one of the first people to view the sky with a telescope. He discovered the moons of Jupiter, the phases of Venus, craters and mountains on the moon, and
Issac Newton Lived in the late 1600's, he discovered that all objects in the universe attract each other through gravitational force and that gravity depends on mass of the objects and the distance between them.
Edwin Hubble Lived in the eartly 1900's, he discovered that there are other galazies outside the Milkyway galaxy.
Non optical telescopes Telescopes that see other portions of the electromagnetic spectrum that we can't see. They are in space because some of the electromagnetic spectrum is blocked by our atmosphere.
Radio telescopes These telescopes detect radio waves, they are very large and can be linked together to work together to act like one giant telescope.
Celestial sphere The imaginary sphere of space that surrounds the earth.
Celestial equator Is an imaginary circle created by the extension of Earth's equator into space.
Declination Degrees in north or south of the celestial equator. Use to describe coordinates of a star to others all over the world.
Right ascension Are hours eastward from the vernal equinox. Use to describe coordinates of a star to others all over the world.
Circumpolar Star Stars that are close to the poles, they do not rise and fall like the other stars. They can be seen the same time of night throughout the whole year. Polaris (the north star) is a circumpolar star.
Doppler effect 1. A phenomenon in which sound seems to increase or decrease in relation the the direction it is moving.
Red shift When a star/galaxy is moving quicky away from the observer, the light emitted looks redder than it normally does
Blue shift When a star/galaxy is moving quicky towards the observer, the light emitted looks bluer than it normally does
Created by: kibbylj
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