The phrase "a space expert" is correct and usable in written English.
You can use it to refer to someone who has extensive knowledge or expertise in the field of space science, exploration, or technology.
Example: "Dr. Smith is a space expert who has worked on several NASA missions and contributed to our understanding of the universe."
Alternatives: "a space specialist" or "an aerospace expert."
"It's really only possible with plutonium 238 to do what it's intending to do," said Dr. John M. Logsdon, a space expert at George Washington University.
Exactly how useful low-Earth orbit satellites would be to domestic government users is a central question, said John Pike, a space expert and director of GlobalSecurity.org.org
JOHN M. LOGSDON a space expert, on the contents of NASA e-mail messages sent in the days before the shuttle disaster.
James Oberg, a space expert and former NASA engineer, says that the report's recommendation to develop commercial orbital access is central to some of the options.
John Pike, a space expert at the Federation of American Scientists, which generally opposes the antimissile research program, said the need for some space vehicle capable of lifting heavy loads had long been apparent but that it had always been thought to be a decade away.
North Korea appears to be struggling to control a satellite it put into orbit last week, a space expert has said.
Instead they were packed with ad hoc demonstrations, slick graphics and the unquenchable energy of a true space expert.
"Demonstrably, we do have an [anti-satellite] capability now," said David Mosher, a Rand Corp. defense and space expert.
At the annual Robert H. Goddard Memorial Symposium this week in Greenbelt, Md., a student from Purdue University asked a panel of space experts a pointed question: What's harder in spaceflight, the technical engineering or the political engineering?
John Tylko, a space shuttle expert at the Massachusetts Institute of Technology, said yesterday that the foam seemed a likely candidate.
"It won't last," Ann M. Florini, a space reconnaissance expert at the Carnegie Endowment in Washington, said of state censorship.
