41 relations: Accretion (astrophysics), Arp-Madore 2, Astronomer, Canis Major, Constellation, Degree (angle), Disc (galaxy), Galactic Center, Galactic halo, Galaxy, Galaxy formation and evolution, Globular cluster, Gravitational field, Infrared, Irregular galaxy, Light-year, Local Group, Messier 79, Milky Way, Monoceros Ring, NASA, NGC 1261, NGC 1851, NGC 2298, NGC 2808, Open cluster, Red giant, RR Lyrae variable, Sagittarius Dwarf Spheroidal Galaxy, Satellite galaxy, Sloan Digital Sky Survey, Solar System, Star, Star formation, Stellar classification, Sun, Thick disk, Thin disk, Tidal force, 100 exametres, 2MASS.
In astrophysics, accretion is the growth of particles into a massive object by gravitationally attracting more matter, typically gaseous matter in an accretion disc.
Arp-Madore 2 (AM 2, ESO 368-SC 07, IAU cluster number C0737-337) is an open cluster of stars in Puppis.
An astronomer is a scientist in the field of astronomy who studies stars, planets, moons, comets, and galaxies, as well as many other celestial objects.
Canis Major is a constellation in the southern celestial hemisphere.
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of plane angle, representing of a full rotation.
A disc is a component of disc galaxies, such as spiral galaxies, or lenticular galaxies.
The Galactic Center is the rotational center of the Milky Way.
The galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component.
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas and dust, and dark matter.
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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.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
In physics, a gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body.
Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments).
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An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy.
A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
The Local Group is the galaxy group that includes the Milky Way.
Messier 79 (also known as M79 or NGC 1904) is a globular cluster in the Lepus constellation.
The Milky Way is the galaxy that contains our Solar System.
The Monoceros Ring is a long, complex, ringlike filament of stars that wraps around the Milky Way three times.
The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.
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NGC 1261, also known as Caldwell 87, is a globular cluster in the constellation Horologium, first discovered by James Dunlop in 1826.
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NGC 1851 is a globular cluster located in the constellation Columba.
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NGC 2298 is a globular cluster in the southern constellation of Puppis.
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NGC 2808 is a globular cluster in the constellation Carina.
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An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.
The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way.
A satellite galaxy is a galaxy that orbits a larger galaxy due to gravitational attraction.
The Sloan Digital Sky Survey or SDSS is a major multi-filter imaging and spectroscopic redshift survey using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory in New Mexico, United States.
The Solar SystemCapitalization of the name varies.
A star is a luminous sphere of plasma held together by its own gravity.
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Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse to form stars.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.
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The thick disk is one of the structural components of several galaxies, including the Milky Way.
The thin disk is a structural component of certain galaxies.
The tidal force is a secondary effect of the force of gravity and is responsible for the tides.
To help compare different orders of magnitude, this page lists distances starting at 100 Em (1020 m or 11,000 light years).
The Two Micron All-Sky Survey (2MASS) was a survey of the whole sky in three infrared wavebands around 2 micrometres (μm): J (1.25 μm), H (1.65 μm), and Ks (2.17 μm).
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