Astrophysics Terms

  • Created by: Ivan
  • Created on: 20-02-13 17:17
Binary Star
Two stars orbiting a common centre
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Black Dwarf
The remnant of a white dwarf after it has cooled down. It has a very low luminosity.
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Black Hole
A singularity in space-time: the end result in the evolution of a very massive star
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Brown Dwarf
gas and dust that did not reach high enough temperatures to initiate fusion. These objects continues to compact and cool down
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Cepheid Variable
A star of variable luminosity. The luminosity increases sharply and falls off gently with a well-defined period. The period is related to the absolute luminosity of the star and so can be used to estimate distance to the star.
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Clusters of Galaxies
Galaxies close to each other and affecting each other gravitationally, behaving as one unit
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Comet
A small body (mainly ice and dust) orbiting the sun in an elliptical orbit
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Constellation
A group of stars in a recognizable patter that appear to be next to each otherin space
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Dark Matter
Generic name for matter in galaxies and clusters of galaxies that is too cold to radiate. Its existance is inferred from techniques other than direct visual observation
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Galaxy
A collection of a very large number of stars mutually attracting each other through the gravitational force and staying together. The number of stars in a galaxy varies from a few million in dwarf galaxies to hundreds of billions in large galaxies.
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Interstellar Medium
Gases and dust grains filling the space in between stars. The density of interstellar mass is very low . there is about one atom of gas for every cubic centimeter of space
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Man Sequence Star
A normal star that is undergoing fusion of hydrogen into helium. Our sun is a typical main sequence star.
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Neutron Star
If a red giant is very large, the end result of the explosion throwing off mass will be a star even smaller than a white dwarf and very dense. This star consists almost entirely of neutrons.
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Nova
The sudden increase in luminosity of a white dwarf caused by material from a nearby star falling into the white dwarf
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Planetary Nebula
The ejected envelope of a red giant star
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Pulsar
a rapidly rotating neutron star emitting electromagnetic radiation in the radio region. Pulsars have very strong magnetic fields. Periods of rotation vary from a few milliseconds to seconds.
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Quasars
Powerful energy emitters. these are very active cores of young galaxies. The energy output from a quasar is greater than that of hundreds of galaxies combined. From redshift measurements, quasars are known to move away from us at very high speeds.
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Red Dwarf
a very small star with low temperature, reddish in colour
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Red Giant
A main sequence star evolves into a red giant-a very huge, reddish star. There are nuclear reactions involving the fusion of helium into heavier elements.
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Stellar Cluster
a group of stars that are physically near each other in space, created by the collapse of the same gas cloud
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Supernova
The explosion of a red supergiant star. The amount of energy emitted in a supernova explosion can be staggering - comparable to the total energy radiated by our sun in its entire lifetime!
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White Dwarf
A red giant at the end stage of its evolution wil throw off mass and leave behind a small (the size of earth), very dense star in which no nuclear reactions take place. It is very hot but its small size gives it a very low luminositt
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Other cards in this set

Card 2

Front

The remnant of a white dwarf after it has cooled down. It has a very low luminosity.

Back

Black Dwarf

Card 3

Front

A singularity in space-time: the end result in the evolution of a very massive star

Back

Preview of the back of card 3

Card 4

Front

gas and dust that did not reach high enough temperatures to initiate fusion. These objects continues to compact and cool down

Back

Preview of the back of card 4

Card 5

Front

A star of variable luminosity. The luminosity increases sharply and falls off gently with a well-defined period. The period is related to the absolute luminosity of the star and so can be used to estimate distance to the star.

Back

Preview of the back of card 5
View more cards

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main sequence

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