CNN  —  Longtime NASA astronaut Don Pettit, who has ventured to space four times, is due to return to Earth on Saturday night from the International Space Station. Pettit will turn 70 on Sunday. The scientist invented the first object patented in space — called the Capillary Beverage , Space Cup or Zero-G cup, which makes it easier to drink beverages in the absence of gravity, and he is also a celebrated astrophotographer known for capturing unique views of the cosmos . “One of the things I