Pearson/Prentice-Hall Earth Science Chapter 25
Terms in this set (22)
pattern of stars
Two stars that orbit one another - these stars are used to determine mass
distance traveled by light in one year equal to 9.5 trillion kilometers
the brightness of a star as seen from Earth
The actual brightness of a star
90% of all stars are in this stage - If HOT then bright, if cool then dim.
a very large red star, occurs after the main sequence stage in medium and high mass stars when fusion moves outward when all the hydrogen in the core has fused into Helium.
an extremely bright star of very large diameter and low density - forms when the fusion in a very massive main sequence star moves outward
Cepheid Variable Stars
these stars get brighter and fainter in a regular pattern
the sudden brightening of a star - happens frequently in binary stars made of a Red Giant and a white dwarf when the gravity of the white dwarf "captures" the outer gases of the red giant.
large clouds of gas and dust floating in space - The result of an exploding massive star
a developing star not yet hot enough to engage in nuclear fusion
the brilliant explosion of a dying supergiant star - creates a nebula and leaves a neutron star or black hole at it's core.
the remains of low mass and medium mass stars
the small, dense remains of a high-mass star after a supernova - forms when electrons and protons fuse to form neautrons.
a source that radiates short bursts of pulses of radio energy - frequently a rapidly spinning neutron star.
final stage in the evolution of a very massive star, where the core's mass collapses to a point that its gravity is so strong that not even light can escape
groups of stars, dusts, and gases held together by gravity
clusters of galaxies
proves that the universe is expanding. The farther a galaxy is, the faster it moves away from us. V = H x d
Big Bang Theory
the theory that the universe originated 13.7 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature
A method used to determine the distance of a relatively close star. The angle between 2 stars change when observed from 2 different locations. The change in this angle is only large enough to measure for stars which are relatively close.
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