Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1

NASA discovery (22th February 2017): Detection  of a system of seven Earth-sized planets just 40 light-years away  TRAPPIST–South,  NASA Spitzer Space Telescope,  Very Large Telescope  At least the inner six planets are comparable in both size and temperature to the Earth (rocky). The host star: 8% the mass of the Sun (a bit larger than Jupiter)

Orbital properties:

Habitable zone: All seven planets discovered in the system could potentially have liquid water on their surfaces TRAPPIST-1b, c and d, are probably too hot to support liquid water

Transit method for detecting exoplanets:

TTV: Transit-Timming variation