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20 terms

Stars and galaxies

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Supergiant
relatively cool star that has expanded to more than 700 times as large as our sun
CONSTELLATIONS
groups of stars whose positions in the sky seem to change as earth moves
photosphere
lowest layer of the sun's atmosphere that gives off light
Main Sequence
classification of about 90% of the stars
absolute magnitude
actual amount of light a star gives off
Binary System
two or more stars revolving around one another
Supernova
produced from an explosion that occurs when a star's core collapses
neutron star
a star in which only neutrons can exist in its core
black hole
an object so dense that nothing, including light, can escape it.
Galaxy
a large group of stars gas and dust held together by gravity
Giant
large cool expanding star in which hellium fuses to form carbon
Apparent magnitude
amount of a stars light observed on earth
Parallax
apparent shift in position of a object when viewed from different places used to determine distances
Light Year
distance that light travels in one year
Sunspots
Dark cooler areas of the sun's surface
Chromosphere
layer of the sun atmosphere above the photosphere
Corona
outer layer and largest part of the sun's atmophere
White Dwarf
small hot star consisting of a hot dense core contracting under the force of gravity
nebula
Earlier stage of a stars formation
Big Bang Theory
Explanation for the beginning of the universe