OrbitalHub

Wikipedia dicit:

The International Space Station (ISS) is a modular space station (habitable artificial satellite) in low Earth orbit. It is a multinational collaborative project between five participating space agencies: NASA (United States), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada). The ownership and use of the space station is established by intergovernmental treaties and agreements. The ISS program evolved from the Space Station Freedom, an American proposal in the 1980s to construct a permanently crewed Earth-orbiting station.

The ISS serves as a microgravity and space environment research laboratory in which scientific experiments are conducted in astrobiology, astronomy, meteorology, physics, and other fields. The station is suited for testing the spacecraft systems and equipment required for possible future long-duration missions to the Moon and Mars. It is the largest artificial object in space and the largest satellite in low Earth orbit, regularly visible to the naked eye from Earth’s surface. It maintains an orbit with an average altitude of 400 kilometres (250 mi) by means of reboost manoeuvres using the engines of the Zvezda Service Module or visiting spacecraft. The ISS circles the Earth in roughly 93 minutes, completing 15.5 orbits per day.

The station is divided into two sections: the Russian Orbital Segment (ROS), operated by Russia; and the United States Orbital Segment (USOS), which is shared by many nations. Roscosmos has endorsed the continued operation of ISS through 2024, but had previously proposed using elements of the Russian segment to construct a new Russian space station called OPSEK. As of December 2018, the station is expected to operate until 2030.

Video credit: NASA

NASA dicit:

Wherever there are humans, there are microbes, too. Bacteria and fungi live all around us, in our homes, offices, industrial areas, the outdoors – even in space. People literally could not live without these tiny organisms, many of which are beneficial.

The trick is limiting the number of potentially harmful ones, particularly in a contained environment such as a spacecraft. So from the launch of the very first module of the International Space Station, NASA has monitored its microbial community.

Because the station is an enclosed system, the only way that microbes get there is hitching a ride on the contents of resupply spacecraft from Earth and on arriving astronauts. The NASA Johnson Space Center Microbiology Laboratory puts a lot of effort into knowing which microbes ride along.

Video Credit: NASA Johnson

Updated tasks on U.S. EVA 53.

Video Credit: NASA

NASA dicit:

“The SpaceX Crew Dragon spacecraft undocks from the International Space Station on March 8, 2019 after nearly 5 days aboard the orbiting laboratory during the company’s Demo-1 mission for NASA’s Commercial Crew Program and descends to re-enter the Earth’s atmosphere. Just over 5 hours later, the uncrewed spacecraft splashes down in the Atlantic Ocean off the coast of Florida and is recovered by SpaceX teams.”

Video Credit: NASA

NASA dicit:

“Demonstration Mission-1 (Demo-1) was an uncrewed flight test designed to demonstrate a new commercial capability developed under NASA’s Commercial Crew Program. The mission began March 2, when the Crew Dragon launched from NASA’s Kennedy Space Center in Florida, and racked up a number of “firsts” in less than a week.

First commercially-built and operated American crew spacecraft and rocket to launch from American soil on a mission to the space station.
First commercially-built and operated American crew spacecraft to dock with the space station.
First autonomous docking of a U.S. spacecraft to the International Space Station.
First use of a new, global design standard for the adapters that connect the space station and Crew Dragon, and also will be used for the Orion spacecraft for NASA’s future mission to the Moon.

NASA and SpaceX teams gathered in the early morning hours at the company’s headquarters in Hawthorne, California, to follow the spacecraft’s return journey and ocean splashdown.”

Video Credit: NASA

NASA dicit:

“Launched on March 2, 2019, from Kennedy Space Center aboard a Falcon 9 rocket, the SpaceX Crew Dragon successfully reached low-Earth orbit and docked autonomously to the International Space Station. This first, uncrewed demonstration flight of the Crew Dragon is an end-to-end test of all the spacecraft’s system and provides NASA valuable data toward certifying it to fly astronauts.”

Video Credit: NASA