Can Russia rival the X-37B space plane with its own robotic spacecraft?

Mr. Shcherbakov says it's quite likely that Russia is working on its own space plane, since the Kremlin nowadays identifies successful space projects as key to boosting Russia's international prestige and has spent a lot more money on the once-moribund space industry.

"Nowadays there's more financing, so the search for cutting-edge projects that we can accomplish is going on intensively," he says. "When the Boeing X-37 was tested, it raised questions from the bosses about whether we were building one, too. But this is a secret subject in the US, and even more so here. So no one will tell you for sure."

The once-mighty Soviet space program virtually collapsed during the 1990s, and its only big remaining project is to act as a kind of "space taxi" to ferry astronauts to the International Space Station.

The USSR built a space shuttle, the Buran, which was modeled on the US version, but only managed to test it twice before the program was scrapped in 1993. The surviving copy of the Buran serves as a children's attraction in Moscow's riverside Gorky Park amusement center.

But with growing financial resources, Russian space scientists have a lot more ideas on their drawing boards these days. These include a nuclear-powered spacecraft that could carry cosmonauts to Mars, and a Pac Man-like nuclear powered space pod that could gobble up space garbage and perhaps be used to protect the Earth from asteroid collisions.

A functioning space plane might be useful for the Russians to service the new Glonass satellite network, Russia's answer to the American GPS system, which is still on track to launch this year despite a disastrous crash that cost the program three satellites last December.

Andrei Ionin, an independent space expert, says that Ostapenko's hint about a Russian version of the X-37B is hard to interpret.

"It is the logic of space research that both Russia and the US usually find themselves doing much the same things," he says. "They built a shuttle, we built a shuttle, and so on. But comments like Ostapenko's should be followed by demonstrations and proper official statements. As things stand, who knows what he meant? Perhaps it was just a bit of PR?"

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