Russian billionaire and venture capitalist Yuri Milner may be famous for being an early backer of Facebook and Twitter and later backing Spotify and Airbnb.
But he's also known for his Breakthrough Initiatives, a scientific program to investigate the questions of life in the Universe, and for putting up $200 million in funding to revive the Search for Extraterrestrial Intelligence (SETI). This includes a project called Breakthrough Starshot, which has created tiny spaceships the size of a micro-memory chip. Each ship is equipped with sensors and a laser to transmit data back to Earth, a camera, and is powered by light.
On Tuesday he showed off these smallest spaceships on earth.