In a surprise development, a spacecraft departed from the International Space Station (ISS) yesterday, leaving scientists and space enthusiasts wondering what could be its identity. The unexpected departure has sparked a flurry of speculation and questions, as many had been expecting the arrival of the next Starliner spacecraft, the latest spacecraft designed to carry astronauts to and from the orbiting laboratory.

The spacecraft, which has been identified as a Soyuz MS-19, was spotted leaving the ISS yesterday evening, according to NASA officials. The Soyuz spacecraft, which is operated by Russia’s Roscosmos space agency, had been docked at the ISS since its arrival in October 2020.

While the Soyuz MS-19 was not carrying any new astronauts to the station, it is believed to be carrying a crew of two Russian cosmonauts, Anton Shkaplerov and Petr Dubrov, who will be returning to Earth after spending six months on the ISS. The Soyuz spacecraft is the primary manned spacecraft used by Russia to transport its cosmonauts to and from the ISS.

The departure of the Soyuz MS-19 has raised questions about the status of the Starliner spacecraft, which was scheduled to dock at the ISS yesterday. The Starliner, developed by Boeing’s commercial crew program, is designed to carry up to seven astronauts to the ISS and is seen as a key component of NASA’s plan to restore its capability to launch crewed missions to the ISS.

The Starliner’s mission, which was scheduled to carry NASA astronauts to the ISS, has been delayed several times due to technical issues and a previous launch abort. While the exact reason for the delay is not yet known, it is believed that the issue may be related to the spacecraft’s propulsion system.

Despite the delay, NASA officials have expressed confidence that the Starliner will be able to launch soon and that the ISS crew will be happy to welcome its arrival. “The Starliner is a fantastic spacecraft, and we’re excited to see it launch and get our astronauts to the ISS,” said a NASA spokesperson.

In the meantime, the Soyuz MS-19 spacecraft will return to Earth, carrying its crew of two Russian cosmonauts back to Kazakhstan. The crew’s departure marks the end of their six-month stay at the ISS, which has been a busy and productive period for the three-person crew.