Q&A with Martin Halliwell, chief technology officer at SES

SpaceX test-fired the Crew Dragon spacecraft’s eight SuperDraco abort engines Wednesday at Cape Canaveral, paving the way for a high-altitude rocket escape test and demonstrating engineers have apparently fixed the problem that triggered an explosion during a similar ground firing in April.

A day-and-a-half after lifting off from Cape Canaveral, a SpaceX Dragon supply ship arrived at the International Space Station on Wednesday with more than 5,800 pounds of experiments, provisions and other hardware to support the orbiting lab’s six-person crew. The cargo capsule was captured by the station’s robotic arm at 6:40 a.m. EDT (1040 GMT).

Forecasters predict mostly cloudy conditions and a chance of light rain for Tuesday morning’s scheduled takeoff of a SpaceX Falcon 9 rocket with a space station-bound supply ship, with a 40 percent chance weather could prevent liftoff during an instantaneous predawn launch opportunity.