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MELISSA BLOCK, HOST:

It's been nearly a year since the space shuttle program ended. And while Americans may have fretted over the crushed dreams of kids hoping to grow up and become astronauts, a private company, SpaceX, has been moving forward. Tomorrow morning, SpaceX will attempt its first mission to the International Space Station. The Falcon 9 rocket will launch an unmanned spacecraft from Cape Canaveral. Astrophysicist and NPR blogger Adam Frank thinks this is huge.

If all goes as planned, he says, our real space age will begin.

ADAM FRANK, BYLINE: So what's the big deal? Well, the Falcon 9 is a private spaceship, fully developed and owned by the private company SpaceX. And SpaceX is the brainchild of Elon Musk, the Internet billionaire who made his fortune from PayPal. With contracts from NASA to develop new launch platforms, SpaceX and other companies are poised to make space the domain of profitable businesses. And Musk has been explicit about his intentions to go beyond Earth orbit, to build commercially viable ventures that might take people to Mars in a decade or two.

His timing couldn't be any better or any more urgent. Even without the space shuttle, America needs to remain a leader in space. Now, when I was a kid, the U.S. space program fueled my imagination and led me into a life of science. But as I got older, it became clear that the real business of getting a human presence across the solar system was going to have to fall to business. Governments might get the exploration of space started, but the vagaries of election and budget cycles meant they could never go further.

Now, we've reached the point where it's the exploitation of space that matters. And while exploitation might seem a dirty word to some folks, they should stop to consider how dependent we are already on the commercialization of that region of space we call low earth orbit. Think of the billions of dollars in commercial activity tied to weather prediction, global broadcasting and global positioning. All this business depends on satellites orbiting overhead right now.

But if, as a species, we want to go beyond the thin veil of space directly overhead, then the basic principles of private venture and risk will have to apply. These are the ones that have always applied. While Queen Isabella may have given Columbus his ships to cross the Atlantic, it was private companies that built the seagoing trade routes and brought folks across to settle - for better or worse. Likewise, it's only through commercially viable endeavors that large numbers of humans are getting off this world and into the high frontier of space.

It's no small irony that the billionaires bankrolling the new space entrepreneurship built their fortunes not in jetfighter aerospace manufacturing but in the dream space of the Internet. Like so many of the post-Apollo generation, myself included, these former high-tech whiz kids had their visions of the future forged in rocket fire. In that way, the wide vista of their dreams is uniquely American. While no one can doubt that problems enough exist here on Earth, the high frontier of space has always called to us as a nation.

In stepping out across that threshold, who knows what new solutions we might imagine, what new expressions of our own creativity we might invoke? But none of it will happen unless we get out there. I am counting on that small step that SpaceX will take tomorrow to one day prove to be a giant leap for us all.

BLOCK: That's astrophysicist Adam Frank. He looks up at space longingly from the University of Rochester.

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