versions of the Soyuz spacecraft have been built, including:
- Original Soyuz, 1966,
which held up to three cosmonauts without spacesuits.
- Soyuz ferry, 1972,
to carry two spacesuited cosmonauts and equipment to and from
the Salyut space station.
- Soyuz T ("transport"),
1979, a longer-duration vehicle to carry three spacesuited cosmonauts
to and from the space station.
- Soyuz TM ("modified
transport"), 1986, a further refinement to serve the Mir
the spacecraft evolved, more efficient electronics and navigation
systems were added to the basic design, and the landing module interior
was rearranged to make it more spacious. A version of the Soyuz
will be used as a crew rescue vehicle serving the International