"Jessica and Christina, we are so proud of you". "I don't think I want to do it, I must tell you that".
"This is truly historic", Trump added.
The astronauts' mission is to replace a failed battery charge-discharge unit with a new power controller unit.
Since the cancellation of the female spacewalk in March, NASA has been preparing its spacesuits for a series of 10 spacewalks. NASA deliberate an all-female spacewalk closing spring, however did now now not own enough medium-measurement fits willing to switch.
The International Space Station's Twitter account tweeted Tuesday evening that the spacewalk will take place "no earlier than Friday", updating NASA's earlier announcement that it would happen either Thursday or Friday morning.
As NASA astronauts Christina Koch and Jessica Meir emerged one by one, it marked the first time in a half-century of spacewalking that a woman floated out without a male crewmate. "It's really nice to see how far we've come". "And we're very excited to get this mission underway". This record-breaking spacewalk will be Koch's fourth and Meir's first.
"There have been many other female spacewalkers before us".
This undated combination photo obtained from NASA shows astronauts Christina Koch, left, and Jessica Meir.
The spacewalk, was scheduled for October 21, but was brought forward to Friday.
The astronauts exited from the space station's Quest airlock, with Ms Koch the first to leave the hatch followed by Ms Meir 12 minutes ahead of schedule.
An all-women space walk, involving Koch and NASA astronaut Anne McClain, was originally scheduled for March.
"Big danger, it's not an easy thing to do", Mr. Trump said. This is just the first time that there have been two women outside at the same time.
"You're very courageous, brilliant women and you represent this country so well. You're very fearless people", Trump told them as they wrapped up their spacewalk. "This is a first step because we're going to the moon and then we're going to Mars".
House Speaker Nancy Pelosi (D-Calif.) said it was an epic achievement. Kowal said that's true for the generation of spacesuits that's now on the ISS. "Congratulations to @Astro_Christina & @Astro_Jessica for leaving their mark on history with today's #AllWomanSpacewalk".
Wilson was the second African-American woman to go into space after Mae Jemison.
Sen. Kamala Harris (D-Calif.), a Democratic candidate for the 2020 presidential race, concurred.
Space walks are not easy. "It's more than historic - it's a reminder that for women, even the sky doesn't have to be the limit". Rather than incur the additional hours of labor and risk of prepping another spacesuit before the mission, the team made a decision to switch out the astronauts.
Meir and Koch's spacewalk could last up to six hours.