In fact, the rocket's failed landing on the barge was, according to a Twitter post by the company's CEO, Elon Musk, "Maybe [the] hardest impact to date." Related: On July 4, the Juno spacecraft will finally reach JupiterUpgrades underway to enable rocket to compensate for a thrust shortfall on one of the three landing engines. The company had said in a statement before the launch that the landing would be "difficult,” an accomplishment it has only pulled off a few times before. Second of two satellites being deployed into proper orbit with today's launch https://t.co/XcHFBPEyfk — SpaceX (@SpaceX) June 15, 2016The rocket hit supersonic speeds after launch, then separated as planned, with the second stage continuing into orbit and the first falling back to Earth. — Elon Musk (@elonmusk) June 15, 2016"Ascent phase & satellites look good, but booster rocket had a RUD on droneship," Musk announced on Twitter, later adding that "RUD = Rapid Unscheduled Disassembly :)"Musk also said on Twitter that one of the three engines on the landing portion of the rocket had a low level of thrust.

Source: Fox News June 15, 2016 16:30 UTC