Sarah Brighman, who broke out as the soprano star of "Phantom," is stepping down as a space tourist. Sarah Brightman reportedly paid $52 million to spend 10 days aboard the International Space Station.

Brightman announced she is postponing her mission. She didn't say whether she thought space flight was safe or if she was afraid of the nausea that comes from extended periods of weightlessness. Brightman would have been the second female space tourist to visit the space station. She would have been the ninth paying visitor. She also was would have been the first space station visitor since 2009.

"Ms. Brightman said that, for personal family reasons, her intentions have had to change, and she is postponing her cosmonaut training and flight plans at this time," read a posted to Brightman's website. "She would like to express her extreme gratitude to Roscosmos, Energia, GCTC (Gagarin Cosmonaut Training Center), Star City, NASA and all the cosmonauts and astronauts for their support during this exciting time in her life."

Brightman booked her trip through the Virginia-based company Space Adventures.

Eric Anderson, co-founder and chairman of Space Adventures, hinted that Brightman might make another attempt to board the station.

"Since 2012, Sarah has shared her story of a lifelong dream to fly to space. Her international fame as the world's best-selling soprano has enabled her message to circle the globe, inspiring others to pursue their own dreams," Eric Anderson said.

"We've seen first-hand her dedication to every aspect of her spaceflight training and to date, has passed all of her training and medical tests," Anderson said. "We applaud her determination and we'll continue to support her as she pursues a future spaceflight opportunity."

NASA retired its space shuttle fleet in 2011. Brightman booked her transport on th Russian Soyuz ferry craft, usually reserved for cosmonauts and astronauts.

Brightman got her ticket after a joint U.S.-Russia decision to launch astronaut Scott Kelly and cosmonaut Mikhail Kornienko on a year-long mission, which opened up two seats on a Soyuz crew rotation flight.