Shuttle Atlantis unwrapped ahead of public debut

In this time-lapse video, a Falcon Heavy rocket is lifted into position atop launch pad 39A at the Kennedy Space Center in readiness for a pre-flight test firing of its 27 Merlin main engines.

The second Falcon Heavy fires its first stage engines as part of a routine pre-flight test for the upcoming launch of the Arabsat 6A communications satellite.

After years of delays, the core stage for NASA’s first Space Launch System moon rocket rolled out of its New Orleans factory Wednesday, heading for a NASA site in Mississippi for a test-firing before engineers hope to ship the rocket to its Florida launch base by this fall.