An astronaut marks the 20th anniversary of 9/11 from space.

An astronaut paid tribute from space on the 20th anniversary of the 9/11 attacks.

Shane Kimbrough, a NASA astronaut from expedition 65, remembered the monumental day with remarks from the International Space Station that were shared via Twitter. “To the victims and their families, survivors and first responders: we remember,” he said. “The horrifying images of that day are still present in so many of our minds.”

Mr. Kimbrough remembered that period of time as one where “we saw the strength and resilience of our nation and the incredible support from people all around the world.”

He said the International Space Station is an example of what can be accomplished through global partnership. Mr. Kimbrough spoke from the station’s Japanese Kibo laboratory with an American flag floating in the background.

“Over the last 20 years, we’ve been continuously living together in space while operating among many nations to improve lives for all of us back on Earth,” he said. “People from all over the world and from all walks of life joined together to accomplish the incredible engineering feat of building an International Space Station in low Earth orbit.”

NASA has marked Sept. 11 over the years with ceremonies on Earth, in space and memorials on other planets.