Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/30

Click to flip

30 Cards in this Set

  • Front
  • Back
Absolute Magnitude
Brightness of a star as it is located 32.6 light years from the earth.
Apparent Magnitude
Brightness of a star as it appears from the earth.
Barred spiral galaxy
Type of spiral galaxy with a bar of stars that runs through it's center.
Binary Star
Pair of stars that revolve around each other.
Black Hole
Hole in space with a gravity so great that not even light can escape, formed by the collapse of a very large supernova.
Circumpolar
describing any star that is always visible in the night sky and, from the Northern Hemisphere, can be circling Polaris.
Constellation
Pattern of stars.
Elliptical Galaxy
type of galaxy with a very bright center that contains little dust and gas and is spherical to disklike in shape.
Galaxy
large-scale group of stars.
Giant
Very large, cool, bright star.
Globular Cluster
spherically shaped group of hundreds of stars located around the core of the milky-way galaxy.
HR-diagram
Hertzsprung-Russell diagram; graph showing the relationship of the surface temperature and absolute magnitude of a star.
Irregular Galaxy
type of galaxy with no identifiable shape and an uneven distribution of stars within it.
Light-year
distance that light travels in one year, about 9.5 trillion km.
Main sequence star
Star with characteristics that place it within a band running through the middle of the H-R diagram.
Nebula
Dark cloud of gas and dust in space; first stage in the development of a star.
Neutron star
collapsed core of a supernova consiting of a small, extremly dense ball of neutrons.
Nova
White dwarf star that explodes as it cools, temporarily becoming thousands of times bigger.
Open cluster
loosely shaped group of hundreds of stars.
Parallax
method of determining the distance from the earth to a star based on the shift in the apparent position of the star when viewed from different angles.
Planetary nebula
Expanding shell of gases shed by a dying star.
Protostar
center of a shrinking, spinning nebula; the second stage in the development of a nebula.
Pulsar
Neutron star that emits two beams of radiation that sweep across space.
Quasar
starlike object that gives off radio waves and X rays.
Red Shift
apparent lengthening of the light waves emitted by a star moving away from the earth.
Spiral Galaxy
type of galaxy with a nucleus of bright stars and flattened arms that swirl around the nucleus.
Star
body of gases that gives off a tremendous amount of radiant energy in the form of light and heat.
Supergiant
extremly large, giant star.
Supernova
star that blows apart with a tremendous explosion.
White dwarf
small, hot, dim star.