WATCH LIVE: SpaceX launches the Falcon Heavy, the rocket that could go to Mars

[Diggs]

I still haven't heard how the core booster was lost.

 

[Moltuae]

I still haven't heard how the core booster was lost.

2 (of the 3) engines failed to fire apparently:

https://www.theverge.com/2018/2/6/16980954/spacex-falcon-heavy-rocket-middle-core-failed-landing

The center core was only able to relight one of the three engines necessary to land, and so it hit the water at 300 miles per hour about 300 feet from the drone ship. As a result, two engines on the drone ship were taken out when it crashed, SpaceX CEO Elon Musk said in a press call after the rocket launch. “[It] was enough to take out two thrusters and shower the deck with shrapnel,” he said.

 

[Diggs]

2 (of the 3) engines failed to fire apparently:

https://www.theverge.com/2018/2/6/16980954/spacex-falcon-heavy-rocket-middle-core-failed-landing

That explains that split second image from the barge before things went black.

Thanks