At a distance of 5,500 light years, the blue straggler binary appears as a single point of light, but by analyzing the amount of ultraviolet light, the researchers saw the unmistakable signal of a white dwarf. (sciencedaily.com)
Confocal microscopy uses a single point of light, usually a laser beam, to scan a sample into a series of optical sections, building up each image pixel by pixel. (discovermagazine.com)
In seven of the observations, Gaia was able to make out both the dwarf planet and its moon, but only saw a single point of light in the other two. (newscientist.com)