Examlex
Calculate the size of the event horizon of the supermassive black hole at the center of the Milky Way,the mass of which is .Give your answer in units of AU.
Fovea
A small depression in the retina of the eye where visual acuity is highest due to the presence of a high concentration of cones.
Cones
Photoreceptor cells in the retina of the eye that are responsible for color vision and function best in relatively bright light.
Retina
A layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
Energy
The capacity to do work, which exists in various forms such as kinetic, potential, thermal, electrical, chemical, nuclear, and others.
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