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2. Orion Nebula - Wikipedia

   en.wikipedia.org/wiki/Orion_nebula

   The Trapezium Cluster is a component of the much larger Orion Nebula cluster, an association of about 2,800 stars within a diameter of 20 light years. [10] The Orion Nebula is in turn surrounded by the much larger Orion molecular cloud complex , which is hundreds of light years across, spanning the whole Orion Constellation.

3. NGC 1980 - Wikipedia

   en.wikipedia.org/wiki/NGC_1980

   The Orion Nebula M42 with NGC 1980 on the right (right is south) NGC 1980 (also known as OCL 529, Collinder 72 and The Lost Jewel of Orion [6]) is a young open cluster associated with an emission nebula in the constellation Orion. It was discovered by William Herschel on 31 January 1786. [7]

4. Orion's Sword - Wikipedia

   en.wikipedia.org/wiki/Orion's_Sword

   42 Orionis, also called c Ori, is a B1V magnitude star in the northern half of the Orion nebula. [3] Theta Orionis has a more central position in the nebula, and is actually composed of a multi-star system. [4] Iota Orionis is one of the brightest in the collection, in the south of the Orion nebula.

5. Messier object - Wikipedia

   en.wikipedia.org/wiki/Messier_object

   Charles Messier. The first edition of 1774 covered 45 objects (M1 to M45).The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier's and Méchain's texts indicating that at least one of them knew of the additional objects.

6. Trapezium Cluster - Wikipedia

   en.wikipedia.org/wiki/Trapezium_Cluster

   The Trapezium or Orion Trapezium Cluster, also known by its Bayer designation of Theta 1 Orionis (θ 1 Orionis), is a tight open cluster of stars in the heart of the Orion Nebula, in the constellation of Orion. It was discovered by Galileo Galilei. On 4 February 1617 he sketched three of the stars (A, C and D), but missed the surrounding ...

7. Messier 43 - Wikipedia

   en.wikipedia.org/wiki/Messier_43

   Messier 43 or M43, also known as De Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion.It was discovered by the French scientist Jean-Jacques d'Ortous de Mairan some time before 1731, [3] then catalogued by Charles Messier in 1769.

8. Messier 4 - Wikipedia

   en.wikipedia.org/wiki/Messier_4

   The inclination is at (an angle of) 23° ± 6° from the galactic plane, thus it reaches as much as 1.5 ± 0.4 kpc above the disk. [11] When passing through the disk, this cluster does so at less than 5 kpc from the galactic nucleus. The cluster undergoes tidal shock during each passage, which can cause the repeated shedding of stars. Thus the ...

9. Dual-purpose improved conventional munition - Wikipedia

   en.wikipedia.org/wiki/Dual-purpose_improved...

   The projectile carried 88 M42/M46 grenade-like dual purpose submunitions. The grenades are very similar, but M42 side wall is optimized for fragmentation characteristics while M46s have thicker walls strengthened to withstand additional setback loads in the last three aft layers of the projectile, where they are placed.