"It was such a momentous moment," Christina Koch said.

NASA astronaut Christina Koch reflected on her participation in the first all-woman spacewalk ahead of its one-year anniversary on Sunday (Oct. 18). .

A year ago, Koch and her colleague Jessica Meir, who were both part of the 2013 astronaut class — the first and only astronaut class to be 50% women — took part in the first-ever spacewalk conducted entirely by women.

"It was such a momentous moment … and I think the year has really made me realize that," Koch told Space.com.

On Monday (Oct. 19), the Guinness Book of World Records officially recognized Koch and Meir for their historic spacewalk, and Koch specifically for her mission, the longest single spaceflight by a woman to date.

"Not only is aerospace and technical industry [an area] that has often had under-representation by women, but spacewalking, in particular, is a really stark example of that," Koch said.

She noted that, with this spacewalk, things seem to be starting to turn a corner and a new era is approaching "where no matter who comes on as an astronaut candidate, the expectation that's placed on them that they're going to be a great spacewalker is the same," she said.

Besides this being a historic spacewalk, there were a few other elements of the event that stood out to Koch.

It was "the first time my spacewalk buddy was seeing it through their eyes for the first time," she said.

And before we left … our eyes kind of caught each other and we knew what an amazing moment it really was, and I smiled," she said.

"I see it as a science amplifier, because the space station allows us to achieve scientific discoveries that really are not possible on Earth," Koch said