The Russian spacewalk will build a space station for the new block

That's right; Both are named Sergei, the same spelling.

Anxious about distinguishing two universes?

Sergey Ryzhikov and Sergey Kud-Sverchkov will be preparing the outside of the space station's Russian segment to receive a new module. Ryzhikov, designated EV1 (short for "extravehicular crewmember 1"), will don a spacesuit with red stripes, while Kud-Sverchkov will sport blue stripes as EV2. You can watch it live here, on Space.com, courtesy of NASA TV, or directly via the agency's website.

Two Russian astronauts, wearing huge spacesuits, used the Poisk docking booth on the International Space Station as an airlock for the first time on a Wednesday spacewalk to begin preparing the almost identical Pirs unit for removal next year.

The new Russian multipurpose laboratory module, called "Boat", which is Russian for "science", will replace the Russian Pierce Module.

Because this will be the first time that anyone has used the Poisk module as an airlock for a spacewalking excursion, the cosmonauts will first spend some time checking out the hatch and inspecting it for leaks. In the meantime, several spacewalks will be needed to transfer assets from Peerz and Zaria Madi in preparation for the boat's arrival in April 2021.

"We welcome any and all modules, especially if there is room for them", Rubins said in October. The astronauts arrived on board a SpaceX Crew Dragon, which lifted off from the Kennedy Space Centre in Florida.

The zero gravity indicators, which are usually gentle games, inform the crew when they are in space after launch. As soon as the toy starts to float, they know they are in space.

Yuri, a young astronaut coordinator Olga, wife of Kudd Svereshkov, accompanied them during their October launch. According to NASA, each team should take their own indicator.

Crew-1 carried NASA astronauts Victor Glover Jr., Michael Hopkins, Shannon Walker, and Japanese Soishi Noguchi to the space station for six months.

NASA's Commercial Crew program could expand the astronaut's space station - meaning more scientific and new types of experiments can take place in a unique micro - gravity environment.

All seven groups held a reception on Tuesday. This will be the first long-term crew, including seven members, in 20 years of the space station.

Residents of the ISS are regularly required to partake in spacewalks for maintenance of the space station, which has humans living on-board for the last 20 years.

Previously, the space station hosted up to 13 people, but only for a few days when their crews came and went.