
A planetary survey, called Microlensing Observations in Astrophysics ( MOA), scanned the central bulge of our Milky Way galaxy from 2006 to 2007. He used a 1.8-meter telescope at the Mount John University Observatory in New Zealand and a technique called gravitational microlensing.
In this method, a planet-sized body is indirectly identified as it passes in front of a more distant star, causing the star to illuminate. The effect is like a funhouse cosmic mirror, or magnifying glass: the light from the background star is deformed and amplified, becoming brighter.
Using the latest technology, the Nancy Grace Roman Space Telescope from NASA will conduct an investigation to discover many more exoplanets using powerful techniques available for a wide-field telescope.