'Iceball' planet discovered using host star's gravity
Scientists have discovered an 'iceball' planet, called so because of its star faintness, making it cold and uninhabitable. NASA's Spitzer Space Telescope made the discovery by planet transit method and microlensing. Microlensing uses the host star's gravity to focus background star's light and make it look brighter. A planet is then detected by measuring blips in the background star's brightness.