Astrophysics Definitions

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Doppler Effect
Change in a wave's wavelength caused by the motion of its source
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The Astronomical Unit
Mean distance between the Earth and the Sun
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Main Sequence Stars
Stars that are producing helium in their core
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Grazing Telescopes
Astronomical device for detecting X-Rays
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Focal Length
Distance between the lens axis and the principal focus
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Resolving Power
Smallest angle where two points can be distinguished
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Black Body
A body that absorbs all wavelengths of electromagnetic radiation and cam emit all wavelengths of electromagnetic radiation
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Redshift
The characteristic spectral lines of the elements are all at a longer wavelength than you would expect
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The Hot Big Bang Theory
The universe started off very hot and very dense and has been expanding ever since
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The Cosmological Principal
The Universe is homogeneous and isotropic so it doesn't have a centre
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Homogeneous
Every part is the same as every other part
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Isotropic
Everything looks the same in every direction
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Relative Magnitude
A measure of how bright a star appears to us
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Absolute Magnitude
The relative magnitude of a star when viewed from a location 10 parsec from Earth
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Airy Disc
The bright central spot in the system of diffraction rings formed by an optical system with light from a point source
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Other cards in this set

Card 2

Front

Mean distance between the Earth and the Sun

Back

The Astronomical Unit

Card 3

Front

Stars that are producing helium in their core

Back

Preview of the back of card 3

Card 4

Front

Astronomical device for detecting X-Rays

Back

Preview of the back of card 4

Card 5

Front

Distance between the lens axis and the principal focus

Back

Preview of the back of card 5
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