14 relations: Cepheid variable, Dark galaxy, Dark matter, Dark matter halo, Dwarf galaxy, Galactic coordinate system, Galaxy, Interstellar medium, Magellanic Clouds, Milky Way, Planets beyond Neptune, Satellite galaxy, Solar mass, Star.
A Cepheid variable is a star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.
A dark galaxy is a hypothesized galaxy with no, or very few, stars.
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Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but would account for most of the matter in the universe.
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A dark matter halo is a hypothetical component of a galaxy that envelops the galactic disk and extends well beyond the edge of the visible galaxy.
A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way's 200–400 billion stars.
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The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way galaxy, and the fundamental plane approximately in the galactic plane.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas and dust, and dark matter.
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In astronomy, the interstellar medium (ISM) is the matter that exists in the space between the star systems in a galaxy.
The two Magellanic Clouds (or Nubeculae Magellani) are a duo of irregular dwarf galaxies visible from the southern hemisphere, which are members of our Local Group and may be orbiting our Milky Way galaxy.
The Milky Way is the galaxy that contains our Solar System.
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Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit.
A satellite galaxy is a galaxy that orbits a larger galaxy due to gravitational attraction.
The solar mass is a standard unit of mass in astronomy that is used to indicate the masses of other stars, as well as clusters, nebulae and galaxies.
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A star is a luminous sphere of plasma held together by its own gravity.
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