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  2. Messier 30 - Wikipedia

    en.wikipedia.org/wiki/Messier_30

    It is in this epoch 22.2 kly (6.8 kpc), from the center of the galaxy, compared to an estimated 26 kly (8.0 kpc) for the Sun. [ 12 ] The cluster has passed through a dynamic process called core collapse and now has a concentration of mass at its core of about a million times the Sun's mass per cubic parsec .

  3. Angle bracket (fastener) - Wikipedia

    en.wikipedia.org/wiki/Angle_bracket_(fastener)

    An angle bracket or angle brace or angle cleat is an L-shaped fastener used to join two parts generally at a 90-degree angle. It is typically made of metal but it can also be made of wood or plastic. Angle brackets feature holes in them for screws. A typical example use of is a shelf bracket for mounting a shelf on a wall. In general, angle ...

  4. Bracket (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Bracket_(mathematics)

    U+2329 ⟨ LEFT-POINTING ANGLE BRACKET and U+232A ⟩ RIGHT-POINTING ANGLE BRACKET, which are deprecated [4] In LaTeX the markup is \langle and \rangle: . Non-mathematical angled brackets include: U+3008 〈 LEFT ANGLE BRACKET and U+3009 〉 RIGHT ANGLE BRACKET, used in East-Asian text quotation; U+276C MEDIUM LEFT-POINTING ANGLE BRACKET ...

  5. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    [2] A preliminary version of the catalogue first appeared in 1774 in the Memoirs of the French Academy of Sciences for the year 1771. [3] [4] [5] The first version of Messier's catalogue contained 45 objects, which were not numbered. Eighteen of the objects were discovered by Messier; the rest had been previously observed by other astronomers. [6]

  6. Dumbbell Nebula - Wikipedia

    en.wikipedia.org/wiki/Dumbbell_Nebula

    The Dumbbell Nebula (also known as the Apple Core Nebula, Messier 27, and NGC 6853) is a planetary nebula (nebulosity surrounding a white dwarf) in the constellation Vulpecula, at a distance of about 1360 light-years. [1] It was the first such nebula to be discovered, by Charles Messier in 1764.

  7. Messier 32 - Wikipedia

    en.wikipedia.org/wiki/Messier_32

    Messier 32 (also known as M32 and NGC 221) is a dwarf "early-type" galaxy about 2,490,000 light-years (760,000 pc) from the Solar System, appearing in the constellation Andromeda. M32 is a satellite galaxy of the Andromeda Galaxy (M31) and was discovered by Guillaume Le Gentil in 1749.

  8. Owl Nebula - Wikipedia

    en.wikipedia.org/wiki/Owl_Nebula

    The Owl Nebula (also known as Messier 97, M97 or NGC 3587) is a planetary nebula approximately 2,030 light years away in the constellation Ursa Major. [2] Estimated to be about 8,000 years old, [ 6 ] it is approximately circular in cross-section with a faint internal structure.

  9. Messier 13 - Wikipedia

    en.wikipedia.org/wiki/Messier_13

    Messier 13 was discovered by Edmond Halley in 1714, [2] and cataloged by Charles Messier on June 1, 1764, [9] into his list of objects not to mistake for comets; Messier's list, including Messier 13, eventually became known as the Messier catalog. [10] It is located at right ascension 16 h 41.7 m, declination +36° 28'. Messier 13 is often ...

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