line of sight

line of sight

White dwarf acts as cosmic magnifying glass

12m ago
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http://www.nature.com/news/white-dwarf-acts-as-cosmic-magnifying-glass-1.15072 Using data from NASA's Kepler spacecraft, physicists have observed an increase of just 0.1% in a star's brightness every 88 days, lasting for 5 hours. They say that the effect is the result of an orbiting white dwarf — a dense, compact, burnt-out star whose gravitational effects act as a magnifying glass every time it crosses the line of sight between its companion star and Earth.