Astronaut Jeanette Epps is getting ready to shatter a long-standing glass ceiling on her way to the International Space Station.

NASA announced last week that Epps will go on her first six-month expedition to the orbiting space laboratory next year, making the 49-year-old aerospace engineer of Syracuse, N.Y., the first Black woman to live and work aboard the station for a long-duration mission.

She will take part in the first operational crewed flight of Boeing's CST-100 Starliner. According to the agency, NASA's Commercial Crew Program aims to "develop and operate a new generation of spacecraft and launch systems capable of carrying crews to low-Earth orbit and to the space station."

Epps will be joined by astronauts Sunita Williams and Josh Cassada. "They are both wonderful people to work with, so I'm looking forward to the mission," she said in a video shared on Twitter, adding that she is "super excited" to be part of the crew.

"Jeanette is a fantastic addition to the Starliner-1 team," NASA Administrator Jim Bridestine wrote in a tweet.

Epps, who has a master's degree in science and a doctorate in aerospace engineering, was scheduled to launch into space in 2018.

But without providing any explanations, NASA announced on Jan. 18, 2018, that astronaut Serena Aunon-Chancellor would take her place in a June expedition.

Epps was to "return to NASA's Johnson Space Center in Houston to assume duties in the Astronaut Office and be considered for assignment to future missions," the agency said.

The Washington Post reported at the time that her brother, Henry Epps, suggested that the reason behind the unexpected change in crew had been fueled by racism.

"My sister Dr. Jeannette Epps has been fighting against oppressive racism and misogynist[s] in NASA and now they are holding her back and allowing a Caucasian Astronaut to take her place!" he wrote in a since-deleted Facebook post.

He also linked his post to an online petition demanding his sister's return to the mission.