Arrhenius had been spectacularly vindicated, in part, in the early days of interplanetary exploration.

The technique, pioneered by American engineers and scientists, has become essential to interplanetary exploration, experts said.

"Comets may one day be the fueling stations for interplanetary exploration," Dr. Yeomans said.

The advances in theory about life's origins are coming just as the country is poised for new interplanetary exploration.

He was also working in the Soviet program of interplanetary exploration of Mars.

"The history of interplanetary exploration," he told her unnecessarily.

The first glamour of interplanetary exploration has worn off.

If this is interplanetary exploration, give me archaeology.

And even though they don't look humanoid, they conduct all of our interplanetary exploration.

For other types of flights, including interplanetary exploration, the launch window must permit the flight to take the most efficient course to its very distant destination.