On March 29, Anne McClain and Christina Koch will depart the relative safety of the International Space Station for a spacewalk to fix up the craft’s batteries.

Though rare, a spacewalk alone isn’t history-making. What’s challenging is the fact that this spacewalk will be the first to feature only women astronauts — an inspiring sign that women are catching up with men in discovering the final frontier.

On Wednesday, NASA spokeswoman Stephanie Schierholz confirmed the all-female spacewalk.

“As currently scheduled, the March 29 spacewalk will be the first with only women,” she said to the network.