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Glossary of Astronomy Terms
beginning with letter N
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Nadir Tweet Definition of Nadir Like Definition of Nadir on Facebook
proper noun
  1. A male given name.
Neptune Tweet Definition of Neptune Like Definition of Neptune on Facebook
proper noun
  1. The Roman god of the ocean and of earthquakes.
  2. The eighth planet in our solar system, represented in astronomy and astrology by ♆.
Neptunian Tweet Definition of Neptunian Like Definition of Neptunian on Facebook
noun
  1. An imaginary inhabitant of the planet Neptune.
adjective
  1. Of the Neptune of Greek mythology
  2. Of Neptune, the eighth planet of the Solar System
nereid Tweet Definition of nereid Like Definition of nereid on Facebook
noun
  1. (Greek mythology) One of 50 sea nymphs who were attendants upon Neptune, and were represented as riding on sea horses, sometimes in human form and sometimes with the tail of a fish.
Net Tweet Definition of Net Like Definition of Net on Facebook
proper nounthe Net
  1. (computing) The Internet.
neutrino astronomy Tweet Definition of neutrino astronomy Like Definition of neutrino astronomy on Facebook
noun
  1. (astronomy) the detection and study of neutrinos, in order to investigate astronomical objects and the universe
neutron star Tweet Definition of neutron star Like Definition of neutron star on Facebook
noun
  1. (star): A star that has been so collapsed by gravity that it does not have electrons or proton, protons, since they have been merged into neutrons by the intense pressure. As a result, it is a solid mass of neutrons that is only held apart by the natural strength of the neutrons. If the mass is sufficient, the neutron star collapses into a black hole and becomes a point of infinitely dense matter. The material of a neutron star is sometimes called neutronium, since it lacks anything save neutrons.
New General Catalogue Tweet Definition of New General Catalogue Like Definition of New General Catalogue on Facebook
proper nounnew, New general, General catalogue, Catalogue
  1. (astronomy): A catalogue of deep sky objects compiled in the 1880s by w:John Dreyer, J. L. E. Dreyer using observations mostly from w:William Herschel, William Herschel. It contains nearly 8,000 objects, known as the NGC objects. Objects in the catalogue are numbered, and the letters NGC are prepended to these numbers, as in NGC 224 (the Andromeda Galaxy) or NGC 6205 (the globular cluster in Hercules).
new moon Tweet Definition of new moon Like Definition of new moon on Facebook
noun
  1. The phase of the moon when it is in conjunction with the sun.
  2. The moon when it is in conjunction with the sun.
  3. The phase of the moon when it is waxing.
  4. The moon when it is waxing.
node Tweet Definition of node Like Definition of node on Facebook
noun (pluralnodes)
  1. A knot, a knob; a protuberance; a swelling.
  2. (Astronomy) The point where the orbit of a planet, as viewed from the sun, intersects the ecliptic. The ascending and descending nodes refer respetively to the points where the planet moves from S to N and N to S. The respective symbols are ☊ and ☋.
  3. The joint of a stem, or the part where a leaf or several leaves are inserted.
  4. A hole in the gnomon of a dial, through which passes the ray of light which marks the hour of the day, the parallels of the sun's declination, his place in the ecliptic, etc.
  5. (geometry) The point at which a curve crosses itself, being a double point of the curve. See Crunode, and Acnode.
  6. The point at which the lines of a funicular machine meet from different angular directions; -- called also knot.
  7. The knot, intrigue, or plot of a piece.
  8. A hard concretion or incrustation which forms upon bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint.
  9. One of the fixed points of a sonorous string, when it vibrates by aliquot parts, and produces the harmonic tones; nodal line or point.
  10. A swelling.
  11. (graphtheory) A vertex of a graph.
  12. (computing_theory) (context, computer networking) A vertex or a leaf in a graph of a network; a computer or other device attached to a network
Norma Tweet Definition of Norma Like Definition of Norma on Facebook
proper noun
  1. (given name, female).
northern Tweet Definition of northern Like Definition of northern on Facebook
adjective
  1. Of, facing, situated in, or related to the north.
  2. (context, of a wind) blowing, Blowing from the north; northerly.
  3. Characteristic of the North of England (usually capitalised).
Les Dawson was a famous Northern comedian.
Northern Cross Tweet Definition of Northern Cross Like Definition of Northern Cross on Facebook
proper nounnorthern, Northern cross, Cross
  1. (constellation): A summer asterism of the northern sky, said to resemble a cross. It includes the stars Deneb and Albireo.
North Pole Tweet Definition of North Pole Like Definition of North Pole on Facebook
nounnorth, North pole, Pole
  1. (geography) The northernmost point on Earth, the point of latitude 90°.
  2. (geography) The Magnetic North Pole of Earth.
  3. (geography) The Geomagnetic North Pole of Earth.
North Star Tweet Definition of North Star Like Definition of North Star on Facebook
noun
  1. (astronomy) A star positioned circumpolar to the North Pole.
nova Tweet Definition of nova Like Definition of nova on Facebook
noun (nov, ae)
  1. (astronomy) any sudden brightening of a previously inconspicuous star
nucleus Tweet Definition of nucleus Like Definition of nucleus on Facebook
noun (pl=nuclei, pl2=nucleuses)
  1. (context, chemistry, physics) The massive, positively charged central part of an atom made up of protons and neutrons.
  2. (cytology) A large organelle found in cells which contains genetic material.
  3. The central part (of something), round which others are collected.
  4. An initial part that will receive additions.
This collection will form the of a new library.
  1. (neuroanatomy) A cluster of many neuronal bodies where synapsing occurs.

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