An ordered pair is a pair of numbers that describes the location of a point in the coordinate plane. The first number is called the x-coordinate. The second number is called the y-coordinate.
The crab nebula consists of an oval-shaped mas of the filaments and they are imprints of the progenitor star that surrounds the diffused blue region and is helium-rich, other than gold other elements like the iron, oxygen and the uranium are produced.
