Q&A with Anton Zeilinger, acclaimed quantum physicist

A mysterious space vehicle described by Chinese state media as an experimental reusable spacecraft completed a two-day flight in low Earth orbit Sunday.

Three robotic Mars missions launched from Earth last month have begun fine-tuning their trajectories through the solar system with the first in a series mid-course corrections to take aim on the Red Planet for arrival next February.

China’s space agency said Friday the country’s first Mars rover safely touched down and began sending data back to Earth, joining the United States as the only two nations to successfully land and operate a spacecraft on the surface of the Red Planet.