Harrowing Return to Earth Ends Year in Space for Kelly

Scott Kelly of NASA captured this image, from aboard the International Space Station, of the Soyuz TMA-17M leaving the ISS on Dec. 11, 2015. Credits: NASA/Scott Kelly

American astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko will return to Earth tonight after 340 days aboard the International Space Station. The year in space may have been fairly routine in some aspects (other than goofing around in a gorilla suit,) but the return to Earth aboard the Soyuz capsule will be anything but.After un-docking from the ISS at 8:02 pm EST, the Soyuz—piloted by commander Sergey Volkov—will move about 12 miles away. Then the Soyuz’s braking rockets will be fired for 4 minutes and 49 seconds, slowing the craft by 460 kmh (286 mph.) Then begins the harrowing part.Soyuz will free-fall for 25 minutes, until it hits the Earth’s atmosphere at 100 km (62 miles) above the surface. Then the craft has to withstand a five-minute stretch of extreme heating as it descends to 20 miles above the Earth’s surface. At an altitude of 10.6 km (6.6 miles), a large parachute—called a drogue chute—will deploy from Soyuz’s descent module, helping to slow the craft’s descent. Lastly, rockets will fire, which will lead to a jarring and nerve-wracking touchdown in Kazakhstan. According to Kelly, who has two space shuttle flights to his credit, the whole experience defies description.But it’s what happens when Kelly is back on Earth that is the most important part of this record-breaking 340 day mission aboard the ISS. It’s no coincidence that the mission was exactly 340 days long. That’s how long a manned mission to Mars is expected to take, and Kelly’s and Kornienko’s mission was designed to mimic that. NASA hopes to gain an understanding of the effects a Mars mission will have on the astronauts who make that trip.What’s unique about Kelly is that he has a twin brother Mark—also an astronaut and former shuttle commander—who is being monitored and —> Read More