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  2. Messier 30 - Wikipedia

    en.wikipedia.org/wiki/Messier_30

    Messier 30 (also known as M30, NGC 7099, or the Jellyfish Cluster) is a globular cluster of stars in the southeast of the southern constellation of Capricornus, at about the declination of the Sun when the latter is at December solstice.

  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. 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.

  5. 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 ...

  6. Shapley–Sawyer Concentration Class - Wikipedia

    en.wikipedia.org/wiki/Shapley–Sawyer...

    The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for globular clusters according to their concentration. . The most highly concentrated clusters such as M75 are classified as Class I, with successively diminishing concentrations ranging to Class XII, such as Palomar

  7. 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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