How Astronomers Turned This White Dwarf Into A Magnifying Glass
Typically, astronomers observe the dimming of a star whenever an exoplanet passes in front of it. But what could possibly cause a star to periodically increase its illumination when an object passes in front? The answer, say scientists, is a newly confirmed phenomenon known as “self-lensing.” There’s a binary system about 2,600 light-years from here…