Getting to a distant planet or moon is one thing; stopping in time is quite another. This is the game of atmospheric deceleration, and it reached the next level in June during Nasa's 'flying saucer' test. Designed largely for Mars landings of the future, the Low-Density Supersonic Decelerator (LDSD) is the largest supersonic parachute ever built, with balloon-like pressure vessels that inflate around the spacecraft to slow it from Mach 3.5 to Mach 2 or lower.
It's primarily for sending heavy cargo – twice as heavy as anything sent so far – safely to Mars in advance of more serous robotic, or manned, missions. However, it should also make landings on Martian mountains possible. See you at the top of Olympus Mons.