Russian Supply Ship Hauls Trash, Treadmill from Space Station

A camera aboard Russia's unmanned Progress 50 cargo ship captured this view of the International Space Station just after undocking on July 25, 2013.
A camera aboard Russia's unmanned Progress 50 cargo ship captured this view of the International Space Station just after undocking on July 25, 2013. The cargo ship hauled trash and unneeded gear, including the space station's first treadmill, to be disposed of by burning up in Earth's atmosphere. (Image credit: NASA TV)

An unmanned Russian cargo ship filled with trash and an astronaut treadmill cast off from the International Space Station Thursday (July 25) to make way for a fresh delivery set to launch to the orbiting lab this weekend.

The robotic Progress 50 spacecraft undocked from the space station at 4:43 p.m. EDT (2043 GMT) to end its months-long resupply mission. The spacecraft was expected to begin a fiery plunge back to Earth at 7:53 p.m. EDT (2353 GMT) and ultimately burn up in the atmosphere over the Pacific Ocean, NASA officials said.

According to a NASA spokesman, among the trash and unneeded gear on the Progress 50 spacecraft was the Treadmill Vibration Isolation System — the space treadmill used by astronauts to keep fit during the months of weightlessness living on the station. The treadmill had been used on the station since the first crew took up residence in November 2000.

The space station still has a newer treadmill, called the Combined Operational Load Bearing External Resistance Treadmill (C.O.L.B.E.R.T.) That treadmill is named after TV comedian Stephen Colbert and launched to the station in 2009. NASA named the treadmill for Colbert after a public voting poll resulted in his name being chosen as the moniker for a new space station module. NASA ultimately decided to name the module Tranquility instead. [Photos: TV Comedian Stephen Colbert Visits NASA]

The departure of Progress 50 from the International Space Station sets the stage for the launch of a new Russian cargo ship, the robotic Progress 52 (52P) spacecraft, from the Central Asian spaceport of Kazakhstan on Saturday (July 27). That new cargo ship is scheduled to launch toward the space station at 4:45 p.m. EDT (2045 GMT) and arrive just six hours later during its express delivery flight.

You can watch the launch of Russia's Progress 52 spacecraft on, courtesy of NASA TV. Launch coverage begins Saturday at 4:30 p.m. EDT (2030 GMT).

"That 52P will be delivering just a little over 5,600 pounds of supplies to the International Space Station," a NASA spokesman said during undocking commentary.

Progress cargo ships are disposable spacecraft composed of three modules, much like Russia's crew-carrying Soyuz space capsules. But instead of the central crew capsule on Soyuz vehicles, Progress vehicles have a propellant module laden with fuel for space station maneuvers.

Progress 50 launched toward the space station in February and docked to the orbiting lab's Earth-facing Pirs docking compartment. The Progress 52 spacecraft will dock at the same Pirs port on Saturday night at 10:26 p.m. EDT (0226 July 28 GMT), NASA officials said.

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Tariq Malik

Tariq is the Editor-in-Chief of and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became's Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. In October 2022, Tariq received the Harry Kolcum Award for excellence in space reporting from the National Space Club Florida Committee. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. You can find Tariq at and as the co-host to the This Week In Space podcast with space historian Rod Pyle on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.