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21 terms

Science final (space stuff)

chapter 18 (i think) the one that says chapter test a : studying spacemonth
STUDY
PLAY
copernicus
created a sun-centered theory of the universe
hubble
proved that there were many galaxies
newton
showed that gravity keeps planets and moons in orbit
ptolemy
created an earth-centered theory of the universe
kepler
showed that planets move in elliptical orbits around the sun
galileo
was one of the first astronomers to use a telescope to observe in space
month
roughly, the time required for the moon to orbit once around the earth
refracting telescope
an instrument that uses a set of lenses to focus light
altitude
the angle between an object in the sky and the horizon
day
the time required for the earth to rotate once on its axis
horizon
the line where the sky and the earth appear to meet
constellation
a region of the sky that contains a recognizable
year
the time required for the earth to orbit once around the sun
ecliptic
the apparent path of the sun across the celestial sphere as seen from earth
declination
one can tell how far north or south an object is from the celestial equator by the object's _______
celestial sphere
the imaginary sphere, created by scientists, that surrounds the earth
electromagnetic spectrum
all of the wavelengths of electromagnetic radiation
In Space
where scientists put telescopes to avoid interference from earth's atmosphere
zenith
an imaginary point directly above an observer's head.
the very large array
the largest telescope.
right ascension
the vernal equinox is used to establish a star's_____