Instruct: Given a premise, retrieve a hypothesis that is entailed by the premise.
Query: On February 1, 1990, during a spacewalk, Alexander Serebrov dons an experimental flying armchair that had been delivered to Mir with Kvant 2. Unlike U.S. astronauts, who flew untethered flights with a similar device, the Soviet cosmonaut remains attached to the station with a safety tether, since there is no space shuttle to pick him up in case of an emergency.
They could not risk going out untethered  with no shuttle
Carmen Electra did it in a helicopter.
valentin is a soviet cosmonaut
Kevin stayed on the ride the entire time.
The spacecraft was built in Kazakhstan
Sergei Avdeyev was in space for less than two years
Michael Allen Baker has been on the ISS
A Russian Soyuz spacecraft costs a lot of money.
Chawla was a cosmonaut.
The cup was left chained to a radiator.
Polyakov spent a year and year and over two months in space.
The armchair had a steering wheel.
They are currently the only astronauts to ever do this
The S-99 was built by the Soviet Union
The person assualted remains in critical condion.
Alex used a ladder to retrieve the kit.
Some russians were caught
The soviets have an exploration spacecraft akin to Cassini that they will try to use to discover atmospheres on moons.
Socks have been worn by cell
On June 29, 1995, the Space Shuttle Atlantis made history when it docked with the European Mir space station
The asteroid did not kill the astronaut. 
Anatoly Berezovoy made three flights into space.
The armchair had a comfy seat.
The armchair had a radio.
The armchair has wings.