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

In a head-spinning tweet, President Trump blasted NASA on Friday for its plan to return to the moon, a plan set in motion during a 2017 White House ceremony he presided over, and forcefully endorsed in March on the president’s behalf by Vice President Mike Pence, chairman of the revitalized National Space Council.

SpaceX moved closer to its next launch with a successful hold-down engine firing Saturday at the Kennedy Space Center in Florida, sailing through a readiness check for a planned liftoff Wednesday with a clandestine U.S. government payload named Zuma.

Rocket Lab announced Saturday it will hold off launching an Electron rocket on an orbital test flight until early 2018 as officials face the end of a 10-day pre-approved launch window, after a series of scrubs to ensure the booster is ready for liftoff and wait for ideal weather conditions.