center holes
31barrel spindle — noun : a thick removable spindle for the turntable of a record player designed especially for adapting the turntable to play 45 r.p.m. records with large center holes …
32Centre punch — Center punch Center punch, or Centre punch Centre punch (Mech.) (a) A punch for making indentations or dots in a piece of work, as for suspension between lathe centers, etc. (b) A punch for punching holes in sheet metal, having a small conical… …
33centerbit — center bit n. A drill bit having a sharp center point, used in carpentry for boring holes. * * * …
34Black hole — For other uses, see Black hole (disambiguation). Simulated view of a black hole (center) in front of the Large Magellanic Cloud. Note the gravitat …
35Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …
36Tiger Woods — Personal information …
37Drilling — For other uses, see Drilling (disambiguation). Drilling is a cutting process that uses a drill bit to cut or enlarge a hole in solid materials. The drill bit is a multipoint, end cutting tool. It cuts by applying pressure and rotation to the… …
38Supermassive black hole — A supermassive black hole is a black hole with a mass of an order of magnitude between 105 and 1.8x 1010 solar masses. Most if not all galaxies, including the Milky Way [ Seeing a Star Orbit around the Supermassive Black Hole at the centre of the …
39General relativity — For a generally accessible and less technical introduction to the topic, see Introduction to general relativity. General relativity Introduction Mathematical formulation Resources …
40Dark matter — Not to be confused with antimatter, dark energy, dark fluid or dark flow. For other uses, see Dark Matter (disambiguation) …
