Transcript Chapter 21 power point - Laconia School District

Chapter 21 power point
• Stars,galaxies,
and the universe.
constellation
• A pattern of
stars in the
sky.
Visible light
• Electrom
agnetic
radiation
that can
be seen
with the
unaided
eye.
Electromagnetic
radiation
• Energy that
travels through
space in the
form of waves.
Wavelength
• The horizontal
distance between two
wave crests.
Spectrum
• The range of
wavelength of
electromagnetic
waves.
Refracting telescope
• A telescope that uses
one or more mirrors to
gather and focus light.
Convex lens
• A piece of transparent
glass curved so that
the middle is thicker
than the edge
Reflecting telescope
• A telescope that uses
one or more mirrors to
gather light.
Radio telescope
• A device used to
detect radio waves
from objects in space.
Observatory
• A building that
contains one or more
telescopes.
Spectrographs
• An instrument that
separates light into
colors and
photographs the
resulting spectrum.
Galaxy
• A giant structure that
contains hundreds of
billions of stars.
Universe
• All of space and
everything in it.
Light-year
• The distance that light
travels in a year.
Parallax
• The apparent change
in position of an object
when seen from
different places.
Giant star
• A very large star much
larger than the sun.
Apparent magnitude
• The brightness of a
star as seen from
earth.
Absolute magnitude
• The brightness of a
star as if it were a
standard distance from
earth.
Hertzsprung-Russell diagram
• A graph relating the
temperature and
brightness of a star.
Main sequence
• An area on the H-R
diagram that runs from
the upper left to the
lower right and
includes more than
90% of all stars.
Pulsar
• A neutron star that
produces radio waves
Nebula
• A large amount of gas
and dust in space
spreaded out in an
immense volume
Protostar
• A contracting cloud of
gas and dust the
earliest stage of a stars
life.
White Dwarf
• The remaining hot
core of a star after its
outer layers have
expanded and drifted
out into space.
Supernova
• The explosion of a
dying giant or
supergiant star.
Neutron Star
A tiny star that remains
after a supernova
explosion.
Black Hole
• The remains of an
extremely massive
star pulled into a
small volume by the
force of gravity.
Quasar
• A distant galaxy with a
black hole at its center.
Binary Star
• A star system that
contains two stars.
Eclipsing Binary
• A star system in which
one star periodically
blocks light from
another.
Spiral Galaxy
• A galaxy whose arms
curve outward in a
pinwheel pattern
Elliptical Galaxy
• A galaxy shaped like a
flattened ball
containing only old
stars.
Irregular Galaxy
• A galaxy that does not
have a regular shape.
Big Bang
• The initial explosion
that resulted in the
formation and
expansion of the
universe.
Bibliography
• The science
book
• And ->
This power point is by Shanan
Nathan Doug