Q&A with Guido Levrini, ESA’s manager of the Copernicus space segment

Three space fliers rocketed away from the Baikonur Cosmodrome in Kazakhstan on Wednesday, setting off in pursuit of the International Space Station to swap out Soyuz lifeboats for the research lab’s one-year crew. Check out imagery of the late morning liftoff.

The satellite awaiting launch early Saturday from California aboard the final flight of the venerable Delta 2 rocket should allow scientists to more precisely track changes in our planet’s ice sheets, using six green laser beams to chart the height and slope of polar ice and glaciers, providing a key input into climate change research.

A modest European-built spacecraft tuned to test the delicate, cutting edge technologies required to detect gravitational waves, a measurement that scientists say could yield unforeseen discoveries about the universe, is awaiting liftoff aboard a solid-fueled Vega rocket this week.