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35 Cards in this Set
- Front
- Back
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travel in a path
around the Sun |
Orbit
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More oval in shape
than perfectly circular |
Solar system
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Spins on an axis
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Rotate
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An imaginary line
that runs through the middle of an object |
axis
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A force that keeps
satellites in orbit |
Gravity
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Used to measure
distances in the solar system |
An astronomical unit
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A rotating cloud of
dust and gas |
A nebula
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A bowl shaped
depression that forms when an object crashes into a surface |
crater
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The path made
during a revolution around the Sun |
Revolve
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Frozen chunks of
ice, gas and dust |
Comets
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Pieces of rock or
metal in space, smaller than a few hundred meters |
Meteoroids
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Streak of light from
a burning meteoroid |
Meteor
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Meteor that hits
the Earth’s surface |
Meteorite
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Energy in the form of
waves that can travel through space |
Electromagnetic
radiation |
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Light that can be
seen |
Visible light
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The distance
between crests on a wave |
Wavelengths
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The number of waves
that pass through a given point |
Frequency
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All the wavelengths of
the electromagnetic spectrum |
Electromagnetic
spectrum |
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The distance that
light can travel in one year |
Light year
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How bright a star
appears |
Apparent magnitude
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How bright a star
actually is |
Absolute magnitude
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A range of colors that
makes up light |
Spectrum
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Shows the
relationship between star T and absolute magnitude |
H-R diagram
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A band of stars on
the H-R diagram, ranging from Hot/blue/bright to Cool/red/dim |
Main sequence
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Gas & dust from a
nebula pulled together by gravity |
Protostar
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A star that has gone
through the main sequence, is now cooling and glowing red |
Red giant
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A star that has
collapsed and shines white hot |
White dwarfWhite dwarf
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When all energy is gone
and a star has cooled |
Black dwarf
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The outer part of a star
explodes |
Supernova
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Small, dense star
about 10 km |
Neutron star
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An object so dense,
even light cannot escape |
Black hole
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A group of stars
named for a particular figure or shape |
Constellation
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Two or more stars held
together by gravity |
Star system
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star system with two
stars |
Binary system
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A large group of stars,
gas, and dust held together by gravity |
Galaxy
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