Q&A with Elon Musk, SpaceX’s founder and CEO

The launch of a Japanese X-ray telescope and robotic lunar lander has been delayed to no earlier than August, and the launch schedule for another Japanese mission to return samples from a moon of Mars is in doubt as engineers investigate the failure of Japan’s first H3 rocket last month.

Stratolaunch’s rocket carrier jet, the largest aircraft in the world by wing span, took off Saturday morning from the Mojave Air and Space Port in California for its first test flight.

Tech pioneer and entrepreneur Jeff Bezos said this week his growing launch company, Blue Origin, plans to debut a 30-story satellite booster built and launched from Florida by the end of the decade.