Calcite crystals occasionally show phosphorescence or fluorescence, but they are also display birefringence (or double refraction). This strong birefringence causes objects viewed through a clear piece of calcite to appear doubled!
The aim of the top-secret project A119 was to detonate a nuclear bomb on the Moon. The flash of explosive light would have been faintly visible to people on Earth with their naked eye; an US show of force after the Soviet Union took an early lead in the Space Race
The acceleration of the object equals the gravitational acceleration in vacuum. The mass, size, and shape of the object are not a factor in describing the motion of the object. So all objects, regardless of size or shape or weight, free fall with the same acceleration. Thus in a vacuum, a beach ball falls at the same rate as an airliner!