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Nearly 50 years after his mission into space was aborted - and a year after his death - Australian-born astronaut Philip K Chapman is to finally fulfil his life's ambition.
Some of his ashes, sealed in a little capsule, will be taken on a memorial flight into orbit where they will briefly experience space's weightlessness before returning safely to earth.
The flight is scheduled for November 30 this year.
Mr Chapman will then be flown again on a permanent deep space mission.
His wife Marie Tseng says she is pleased he is finally getting to live out his boyhood dream of getting off "this little rock" and exploring the vastness of space.
"He was an adventurer and was committed to supporting commercial space businesses so the Celestis flights resonated well with his life goals and personality," Ms Tseng told AAP.
"He would be sorry that his living self will not be flying because he would want to conduct scientific experiments and revel in the experience.
"The joyful and exciting Celestis flights are wonderful ways for us, the survivors, to commemorate Phil."
Born in Melbourne in 1935, Mr Chapman spoke of his intergalactic dreams from the age of 12 and dedicated his life to advancing space exploration and civilisation.
He trained as a pilot in the Royal Australian Air Force before joining the Australian National Antarctic Research Expeditions for a winter on the frozen continent to experience living in isolated and difficult terrain.
Eager to get to the US, which had the only space program in the 1960s, he joined MIT's Experimental Astronomy Lab and in 1967 became the NASA's first foreign-born scientist-astronaut.
He was mission scientist for Apollo 14 - one of the six that landed humans on the moon - and claimed to be the man behind the televised 'feather and hammer' experiment, where moon walkers tested the three centuries-old Galileo Galilei theory that all objects fall with equal speed in a vacuum. (They did.)
Mr Chapman himself was slated to rocket into space in 1975 as part of the SkyLab B mission but in 1972 it was aborted, with then-president Richard Nixon deciding not to put more money into such projects.
"The Skylab in which I had hoped to live is now a tourist attraction ... I sometimes visit it when I am in Washington but it is very sad to see it wasted," he would tell author Colin Burgess for his 2019 book Shattered Dreams: The Lost and Canceled Space Missions.
Mr Chapman resigned from NASA later that year but never gave up on his passion.
An early space settlement pioneer, he continued to work in the field, developing the private sector commercial space industry - significant especially as it is that industry now enabling his life's ambition to be realised with this posthumous space flight.
"We are honoured to provide Dr Chapman with his 'first' launch to space," said Charles M Chafer, co-founder and CEO of Celestis, Inc - the memorial spaceflight service.
"His legacy as a scientist, astronaut and business leader is reflected in his family's choice to honour him with a final journey among the stars."