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12 relations: Cosmic dust, Disc galaxy, Galactic corona, Galactic halo, Galaxy formation and evolution, Lenticular galaxy, Milky Way, Nucleocosmochronology, Scale height, Spiral galaxy, Star, Thick disk.
Cosmic dust
Cosmic dust, also called extraterrestrial dust or space dust, is dust which exists in outer space, as well as all over planet Earth.
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Disc galaxy
A disc galaxy is a galaxy characterized by a disc, a flattened circular volume of stars.
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Galactic corona
The terms galactic corona and gaseous corona have been used in the first decade of the 21st century to describe a hot, ionised, gaseous component in the Galactic halo of the Milky Way.
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Galactic halo
A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.
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Galaxy formation and evolution
The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies.
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Lenticular galaxy
A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes.
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Milky Way
The Milky Way is the galaxy that contains our Solar System.
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Nucleocosmochronology
Nucleocosmochronology or nuclear cosmochronology is a technique used to determine timescales for astrophysical objects and events.
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Scale height
In various scientific contexts, a scale height is a distance over which a quantity decreases by a factor of e (approximately 2.72, the base of natural logarithms).
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Spiral galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Thick disk
The thick disk is one of the structural components of about 2/3 of all disk galaxies, including the Milky Way.
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