Physics Option D, Astrophysics

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Critical Density
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Density for which the curvature of the universe is zero/at which it will expand forever but will reach zero/at which the universe will begin to contract after an infinite amount of time.
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Stellar cluster
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Stars that are gravitationally bound forming an arrangement in space.
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Constellation
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A collection of stars that form a recognisable group (as viewed from Earth) that need not be gravitationally bound to each other.
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Pulsar
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A rotating neutron star.
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Chandrasekhar limit
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Maximum mass a stable white dwarf can have (1.4 solar masses)
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Galaxy
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Large group of stars

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