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Astronomy vocab Ch 3

constellation a pattern of stars in the sky
spectrum white light shining through a prism spreads out to form one
observatory a building that contains one or more telescopes
wavelength the distance between the crest of one wave and the crest of the next wave
visible light the portion of the electromagnetic spectrum that humans can see with their eyes
spectrograph an instrument that breaks the light from an object into colors and photographs the resulting spectrum
refracting telescope a telescope that uses convex lenses to gather and focus light
reflecting telescope a telescope that uses one or more mirrors to gather light
electromagnetic radiation energy that travels through space in the form of waves
absolute magnitude a stars brightness as if it were a standard distance from Earth
a huge group of stars such as the milky way galaxy
the unit used to measure distances to stars light-year
Hertzsprung-Russell diagram a graph of the stars showing temperature on the x-axis and brightness on the y-axis
parallax to measure the distance of nearby stars
universe all of space and everything in it
apparent magnitude the brightness of a star as seen from Earth
giant stars the star Aldebaran is known for this because of its large size
nebula a huge cloud of gas or dust in space
black hole the remains of an extremely massive star pulled into a small volume by the force of gravity
white dwarf the remaining hot core of a star after its outer layers have expanded and drifted out into space
protostar the earliest stage of a star's life
quasar a distant galaxy with a black hole at its center
pulsar emits pulses of radio waves
neutron star a tiny star that remains after a supernova explosion
supernova an explosion that occurs at the end of a giant star's life
binary stars a star system that contains two stars
eclipsing binary a star system in which one star periodically blocks the light from another
spiral galaxy a galaxy whose arms curve outward in a pinwheel pattern
elliptical galaxies galaxies shaped like a flattened ball, containing only stars
irregular galaxies galaxies that do not have a regular shape.
Created by: Kayla1