The subtle detections involved using a trick developed by other researchers. After taking the first image of a white dwarf and its surroundings, Hubble was rolled slightly in space and a second image was made. By comparing the two images, scattered light created by instrument imperfections can be removed, Debes explained. That way the star is reduced more closely to a point-like source. Remaining nearby points of light then emerge as either dim orbiting companions or background objects.
http://www.space.com/scienceastronomy/mystery_monday_040510.html
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