Transcript Vocabulary Review

Unit 1
The Universe
Vocabulary Review
a large celestial body that is
composed of gas and emits light
star
a graph that shows the
relationship between a star’s
surface temperature and
absolute magnitude
H-R diagram
a gigantic explosion in which a
massive star collapses and
throws its outer layers into space
supernova
a star that has collapsed under
gravity to the point that the
electrons and protons have
smashed together to form
neutrons
neutron star
a small, hot, dim star that is the
left over center of an old sun-like
star
white dwarf
space and all the matter and
energy in it
universe
the brightness of a star as seen
from Earth
apparent magnitude
a collection of stars, gas, and
dust held together by gravity
galaxy
location on the H-R diagram
where most stars lie; it has a
diagonal pattern from the lower
right to the upper left
main sequence
a measure of how bright a star
would be if it were seen from a
standard distance
absolute magnitude
the distance light travels in a
year; about 9.6 trillion km
light-year
a large cloud of gas and dust in
interstellar space; a region where
a star is born
nebula
the Sun and all the planets and
bodies that travel around it
solar system
the actual brightness of an object
such as a star
luminosity
a relatively large spherical body
that orbits a star
planet