Canadian astronaut Chris Hadfield "spots" a UFO in the distance: "The view from where we fly the Canadarm2, with some orbital debris off in the distance," he wrote on Twitter.
In an elaborate April Fools' Day prank, Chris Hadfield took to Twitter to tell the world about a flying saucer heading toward the orbiting outpost.
Chris Hadfield's third April Fools' Day photo shows the station's robotic arm and the UFO in full view.
Chris Hadfield's grand April Fools' Day finale shows him posing with an alien that just stopped by the station to say hi.
NASA astronaut Chris Cassidy (bottom left) wears a felt mustache to match the Canadian astronaut Chris Hadfield on board the International Space Station
Canadian astronaut Chris Hadfield holds up two objects that look like grenades as part of an April Fools' Day prank today (April 1, 2013).
Canadian astronaut Chris Hadfield, Expedition 35 commander, shows the six Easter eggs he packed for his six-man International Space Station crew in a photo posted to Twitter on Easter Sunday, March 31, 2013. [Read the Full Story]
This Easter Sunday sunrise photo taken by Canadian astronaut Chris Hadfield on the International Space Station shows the Great Lakes region of North America on March 31, 2013. [Read the Full Story]
The six-man crew of the Expedition 35 on the International Space Station wave after meeting on March 28, 2013, following the first-ever one-day launch and docking of a Russian Soyuz spacecraft to the International Space Station.
An International Space Station camera caught sight of the Soyuz space capsule as it made its approach to the orbiting outpost on March 28, 2013. [Full Story]
The International Space Station comes into view for the crew of a Spacecraft on March 28, 2013. [Full Story]
Friends and family members of NASA astronaut Chris Cassidy and Russian cosmonauts Pavel Vinogradov and Alexander Misurkin watch as the Soyuz TMA-08M crew arrived at the International Space Station on March 28, 2013, after an accelerated one-day trip. [Full Story]
Expedition 35 crew members take a break from training at NASA's Johnson Space Center to pose for a crew portrait.
The Soyuz TMA-08M rocket launches from the Baikonur Cosmodrome in Kazakhstan on Friday, March 29, 2013 carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m. local time. [See Full Story]
The Soyuz rocket carrying Expedition 35 crew members to the International Space Station launched from Baikonur Cosmodrome in Kazakhstan, March 28, 2013 (ET). [Full Story]
Expedition 35 Russian Flight Engineer Alexander Misurkin, top, NASA Flight Engineer Chris Cassidy, and Soyuz Commander Pavel Vinogradov, bottom, wave farewell from the base of the Soyuz rocket at the Baikonur Cosmodrome in Baikonur, Kazakhstan, Friday, March 29, 2013. Their Soyuz TMA-08M rocket launched at 2:43 a.m. local time.
Canadian astronaut Chris Hadfield floats inside the International Space Station clad all in green for St. Patrick's Day on March 17, 2013.
Canadian astronaut snapped this photo of Tralee, Ireland, from space on March 17, 2013, to celebrate St. Patrick's Day on the International Space Station.
(L to R) Expedition 35/36 Flight Engineer Chris Cassidy of NASA, Expedition 35 Soyuz Commander and Expedition 36 Commander Pavel Vinogradov of Roscosmos and Expedition 35/36 Flight Engineer Alexander Misurkin of Roscosmos are seen during a break in training. Image released March 4, 2013.
At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 35/36 prime crew members Chris Cassidy of NASA (left), Soyuz Commander Pavel Vinogradov (center) and Alexander Misurkin report to Russian space officials March 4, 2013, for the start of qualification simulations in Soyuz and Russian segment trainers.
NASA Flight Engineer Michael Hopkins (left), Soyuz Commander Oleg Kotov (center) and Flight Engineer Sergei Ryazanskiy will serve as backup crew members for Expedition 35/36 to the International Space Station. Image released March 4, 2013.
Russian cosmonaut Alexander Misurkin (left) and NASA astronaut Chris Cassidy (right), both Expedition 35/36 flight engineers; along with Russian cosmonaut Pavel Vinogradov, Expedition 35 flight engineer and Expedition 36 commander, participate in an emergency scenario training session in an International Space Station mock-up/trainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
Russian cosmonaut Pavel Vinogradov, Expedition 35 flight engineer and Expedition 36 commander, is pictured during an emergency scenario training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
Russian cosmonaut Alexander Misurkin, Expedition 35/36 flight engineer, is pictured during an emergency scenario training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
NASA astronaut Chris Cassidy, Expedition 35/36 flight engineer, is pictured during an emergency scenario training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
NASA astronaut Chris Cassidy, Expedition 35/36 flight engineer, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center.
Russian cosmonauts Pavel Vinogradov (left), Expedition 35 flight engineer and Expedition 36 commander, and Roman Romanenko, Expedition 34/35 flight engineer, participate in an emergency scenario training session in an International Space Station mock-up/trainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
Russian cosmonauts Pavel Vinogradov (right), Expedition 35 flight engineer and Expedition 36 commander; and Alexander Misurkin, Expedition 35/36 flight engineer, participate in a routine operations training session in an International Space Station mock-up/trainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.
NASA astronaut Chris Cassidy, Expedition 35/36 flight engineer, prepares for a flight in a NASA T-38 trainer jet at Ellington Field near NASA's Johnson Space Center.
NASA astronaut Chris Cassidy, Expedition 35/36 flight engineer, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, is submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.
Canadian astronaut Chris Hadfield poses with SpaceX's Dragon capsule after it docked successfully with the space station.
Chris Hadfield took a self portrait with SpaceX's Dragon capsule as it approached the International Space Station before Docking.
Astronauts Kevin Ford, Chris Hadfield and Tom Marshburn communicate with social media users in NASA's Google+ Hangout on Feb. 22, 2013.
NASA Astronaut Marshburn demonstrates how he can orient himself in a zero-g environment without touching anything aboard the ISS. The Google+ Hangout took place on Feb. 22, 2013.
Canadian astronaut Chris Hadfield strums a guitar while playing Christmas carols and gazing at Earth from the International Space Station in December 2012.
Christmas in space: NASA astronaut Kevin Ford, commander of the Expedition 34 crew on the International Space Station, wishes the world a Merry Christmas from orbit with a cosmic Christmas tree.
The six-man crew of the International Space Station (including a bearded Father Christmas) wishes Mission Control a Merry Christmas and Happy Holidays on Dec. 25, 2012, during the Expedition 34 mission.
Canadian Space Agency astronaut Chris Hadfield, Expedition 34 flight engineer, watches a water bubble float freely between him and the camera, showing his image refracted, in the Unity node of the International Space Station. Image released Jan. 21, 2013.
Canadian astronaut Chris Hadfield (left) accepts command of the International Space Station from NASA astronaut and out-going station commander Kevin Ford, March 13, 2013.
NASA astronaut Kevin Ford, Expedition 34 commander, watches a water bubble float freely between him and the camera, showing his image refracted, in the Unity node of the International Space Station. Image released Jan. 21, 2013.
Russian cosmonauts Oleg Novitskiy (left) and Roman Romanenko, both Expedition 34 flight engineers, monitor data at the manual TORU docking system controls in the Zvezda Service Module of the International Space Station during approach and docking operations of the unpiloted ISS Progress 50 resupply vehicle. Image released Feb. 11, 2013.
Canadian astronaut Chris Hadfield (top left) and NASA astronauts Cady Coleman and Dan Burbank (in blue flight jackets) perform with the traditional Irish band The Chieftains on Feb. 15, 2013, at Jones Hall in Houston during the bands 50th anniversary tour. Hadfield prerecorded his portion on the International Space Station.
On March 22, 2013, at the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, the Soyuz TMA-08M spacecraft is lowered into place for its encapsulation into the third stage of a Soyuz booster rocket.
