In June 1985 the Soviet Union flew two balloons through the sulfuric-acid clouds of Venus, riding 150-mph winds a third of the way around the planet — the only aircraft ever flown in another world's a...

When the Soviet Venera 13 probe touched down on Venus in March 1982, it survived for 127 minutes in a 465-degree atmosphere that crushed it with the pressure of nearly a kilometre of ocean water, and ...

In 1959, the Soviet Luna 3 probe swung around the far side of the Moon and took 29 grainy photographs of a hemisphere humans had never seen, then developed the film onboard and scanned the negatives w...