Showing posts with label spacewalk. Show all posts
Showing posts with label spacewalk. Show all posts

September 27 - First Chinese Spacewalk!



  
Posted on September 27, 2020




The thing about human space exploration is that the early history of humans blasting into outer space was dominated by the USSR and USA. Soviet cosmonauts and American astronauts kept one-upping each other, with the Soviets taking most of the early leads (first man in orbit, first woman in space, etc.) and the US being the first and so far only nation to land astronauts on the Moon. 


But of course the early history of space flight isn't the only history! Astronauts from at least 37 nations have traveled to space. They come from nations ranging from the Middle East to Eastern Asia, from Europe to Africa, from North America to South America. (I didn't spot any astronauts from Australia or other nations in "Oceania.")


On this date in 2008, Chinese astronaut Zhai Zhigang became the first from his nation to do a spacewalk completely outside the spacecraft. 
He was wearing a space suit developed by his own nation (some Chinese astronauts have worn Russian-derived space suits). 




What's in store in the future of human space exploration? Hopefully it will be friendly competition or even friendlier cooperation!!






March 18 - Celebrating the First Walk in Space!

Posted on March 18, 2020


The "Space Race" between the United States and the Soviet Union ended up pushing both nations to do great things. The Soviets, of course, "won" many laps (first person to reach space, first person in orbit, first person to consume food in space, first person to make multiple orbits during a spaceflight, first group flight, first woman in space, etc., etc.). The U.S. "won" a pretty big lap (first - and so far only) people to land on the Moon, but the U.S. "won" a few other laps, as well, such as the first people to do a space rendezvous and the first space docking.

Today is the anniversary of the first human "spacewalk." The U.S.S.R. "won" this particular feat when cosmonaut Alexei Leonov exited the Voskhod 2 on this date in 1965.


Leonov had spent 18 months (a year and a half!) on weightlessness training before this mission. Of course he was tethered to the spacecraft so he couldn't float away, and even more of course he was wearing a pressurized spacesuit (otherwise he would have died in the vacuum of space). But at the end of the spacewalk (12 minutes after he left the spaceship), Leonov's suit at inflated in the vacuum of space to be too large to fit back into the airlock! Yikes! 

Leonov had to inch his way into the airlock while opening a valve and *carefully* letting some of his precious air out from the inside of the suit. It took a lot longer than he thought it would, and Leonov was both uncomfortable and worried before he finally managed to (barely) squeeze into the airlock. His crewmate Pasha was able to activate the airlock so that there was equal pressure in the airlock and the inside of the spaceship, and Leonov was finally able to get back into the spacecraft. He reported that when he was finally safe, he was "drenched with sweat, my heart racing."

A few months later, Ed White would become the first American to perform a spacewalk. He used an oxygen propelled gun to maneuver and loved being outside in his spacesuit that he stayed outside after his allotted time was up. He had to be ordered back into the spaceship, and he said, "I'm coming back in...and it's the saddest moment of my life." 


Two other things happened during that first American space walk - and they both concerned gloves!

(1) A spare glove floated away through the open airlock, becoming one of the first pieces of known space debris in Earth orbit. (It's not still there - as you might have guessed, when it slowed down enough, it dropped out of orbit and burned up in the Earth's atmosphere.)

(2) There was a mechanical problem with the hatch mechanism, so it was really hard for White's crewmate McDivitt to open and relatch. But McDivitt was able to use his glove to push a gear so that he was able to relatch the door and save both of their lives! Phew!

Back to Alexei Leonov:

Leonov was to have been the first cosmonaut to land on the Moon, but the project was cancelled - I gather because of some launch failures and because the Americans had already been there, done that. The U.S.S.R. decided to halt the lunar program and concentrate on creating a space station.

So Leonov lost a chance for another huge "first" - but he was able to distinguish himself from other cosmonauts and astronauts by being an accomplished space artist! This is one of his paintings.






June 3 – Anniversary of the First American Spacewalk

Posted on June 3, 2014

One of the big deals that most astronauts seem to want to do – and that some of them get to do – is to do a spacewalk.

That means putting on their bulky, cumbersome pressure suits, going through the hatch, and being outside of their spaceships.

It means becoming tiny little satellites in orbit around the Earth, separated from the gorgeous blue-and-white planet and blazing sunlight and incredible spangled sky by nothing more than the gold-plated visors on their helmets!

The first human to do an EVA (extra-vehicular activity) was a Soviet cosmonaut named Alexei Leonov, who accomplished his spacewalk on March 18, 1965. On this date in 1965, astronaut Ed White became the first American to do an EVA.

White and his crewmate James McDivitt both had to put on pressure suits, because their Gemini capsule did not have an airlock. They had to depressurize the entire spacecraft. Then White tried to open the hatch, but the latch was stuck.

McDivitt had seen that this kind of latch had failed to open in a vacuum chamber test on Earth, so he was able to help White get the latch to work and the hatch to open. Then White used a hand-held oxygen-jet gun (also called a zip gun) to maneuver out of the capsule. The first sight that met his eyes was the state of Hawaii serenely floating in the Pacific Ocean.

White was float about 5 meters (15 feet) away from the capsule, where he began to learnto maneuver. He found it easy to learn how to use the zip gun to move, but it ran out of O-2 all too soon.

One of the problems during the spacewalk was that the voice-operated switch (VOX) on their helmets didn't work, and White couldn't hear the people at Mission Control with either VOX or the Push-to-Talk mode. (The guys at Mission Control could hear everything that the astronauts were saying, though.) The guys on the ground were getting frustrated – the CAPCOM had tried to reach the astronauts at least 40 times without a reply – and they really wanted to get the astronauts safely in before the sun disappeared behind the Earth. Finally McDivitt did the Push-to-Talk thing and found out that Mission Control really wanted White back in the spaceship. White asked to take a few more pictures, but McDivitt coaxed him to come back immediately. Since his zip gun no longer worked, McDivitt pulled himself back to the hatch using the 8-meter tether.


Here is the most dangerous part of the EVA – the hatch wouldn't re-latch again. If they couldn't solve the problem, both men would have died as the Gemini capsule returned to Earth. Once again, McDivitt had to fiddle and twiddle, and he was finally able to help White securely close the hatch.

White had spent about 23 minutes out in space. When he had to come back in, he said, “It's the saddest moment of my life.” 

Here is a great National Geographic video about spacewalks!

Also on this date:




































Plan ahead:

Check out my Pinterest boards for:
And here are my Pinterest boards for: