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Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye
This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero
Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th
Taken by Hinode's Solar Optical Telescope on January 12, 2007, this image of the Sun reveals th
Midsagittal section indicating locations of true and false pelves
This image shows a normal third-trimester fetal brain