Twinkle, twinkle little star, how I wonder where you are

August 6, 2004 | Source: Innovations Report

The stars we see are not necessarily where we think they are. Materials with a negative refractive index may be responsible for this locational uncertainty, researchers have found.

Material (such as space dust) that might have a negative index of refraction transmits light or other wave energy in a different direction than one with positive index of refraction. The relative velocity of the observer also changes the refractive index of any material.