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Washington, Mar 11 : Three crew members from the International Space Station returned to Earth Monday after 166 days in space, during which they made 2,656 orbits around the planet and traveled almost 70.5 million miles

Expedition 38 crew members Michael Hopkins of NASA, and Oleg Kotov and Sergey Ryazanskiy of the Russian Federal Space Agency (Roscosmos) touched down southeast of the remote town of Dzhezkazgan, Kazakhstan, at about 11:24 p.m. EDT (9:24 a.m., March 11, in Dzhezkazgan).

During Expedition 38, the crew members participated in a variety of research, including protein crystal growth studies and biological studies of plant seedling growth to technology demonstrations that are helping to improve our understanding of how liquid moves in microgravity.

They conducted student experiments that observed celestial events in space. One of several key research focus areas during Expedition 38 was human health management for long duration space travel, as NASA and Roscosmos prepare for two crew members to spend one year aboard the space station in 2015.

During their time aboard the orbiting laboratory, the three men were there to welcome three visiting cargo spacecraft. Two Russian Progress crafts docked to the station, bringing tons of supplies.

In January, Orbital Sciences Corp.'s Cygnus spacecraft loaded with cargo and experiments flew to the space station as part of the Orbital-1 cargo resupply mission. This was the company's first of at least eight cargo delivery flights through 2016 to the station under NASA's Commercial Resupply Services contract.

Kotov, Ryazanskiy and Hopkins were on hand as Mastracchio, Mikhail Tyurin of Roscosmos and Koichi Wakata of the Japan Aerospace Exploration Agency arrived on Nov. 7, 2013, bearing the Olympic torch used to light the Olympic flame at Fisht Stadium in Sochi, Russia, which marked the start of the 2014 Winter Games in February.

Hopkins and fellow Expedition 38 NASA astronaut Rick Mastracchio ventured outside the confines of the space station during two spacewalks in December to replace a suspect ammonia pump that is part of the station's equipment cooling system. On the Russian side, Kotov and Ryazanskiy conducted three spacewalks.

The first trip outside was to install and replace experiments and hardware attached to the exterior of the Russian segment and display the Olympic torch. The other two walks were to install a pair of cameras on the hull of the station's Zvezda Service Module that are part of a Canadian commercial endeavor with Roscosmos designed to downlink Earth-observation imagery to Internet-based subscribers.

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Space Station crew returns to Earth