Rack (billiards) ball, the ball is placed on the highest available spot. If there is no available spot, it is placed as close to its own spot as possible in a direct line between that spot and the top (black end) cushion, without touching another ball. If there is no room this side of the spot, it will be placed as close to the spot as possible in a straight line towards the bottom cushion, without touching another ball. Rack (billiards) A rack (sometimes called a triangle) is a piece of equipment that is used to place billiard balls in their starting
Bright spots on Ceres Bright spots on Ceres Several bright surface features (also known as faculae) were discovered on the dwarf planet Ceres by the "Dawn" spacecraft in 2015. The brightest cluster of spots ("Spot 5") is located in an crater called Occator. The largest and brightest component of the cluster is in the center of the crater, with dimmer spots located towards this crater's eastern rim. Early in the orbital phase of the "Dawn" mission, the high albedo of these spots was speculated to be due to some kind of outgassing, and subsequent closer images helped scientists determine that it is a material