O'Leary twice traveled to the Soviet Union in the late 1980s to promote the peaceful exploration of space.

It had always unsettled him when circumstances required the employment of such martial methods aboard what was supposed to be a ship of peaceful exploration.

Prior to their first encounter with humans, Vulcans had prided themselves on their policy of peaceful exploration.

May the judge disappear, and the philosopher continue the peaceful exploration of the sea!

We are on a mission of peaceful exploration.

My people were engaged in a peaceful exploration of the planet and you disintegrated them!

The Beetles made their plans exceedingly clear but they might be exceptions to the rule of peaceful exploration.

Another consideration was that the Navy proposal used civilian sounding rockets rather than military missiles, which were considered inappropriate for peaceful scientific exploration.

There's no sign the Borg have been here, and our primary mission remains peaceful exploration and first contact.

This is a private ship engaged in peaceful exploration.