Photos: Delta 4-Heavy launch gallery

Engineers plan to redesign part of the Orion capsule’s self-righting flotation system that only partially engaged as the spacecraft splashed down in the Pacific Ocean following an orbital test flight in December, NASA officials said.

This video recaps the Orion spacecraft and its Delta 4-Heavy rocket preparations for launch on the Exploration Flight Test No. 1.

Data from the encounter of NASA’s New Horizons spacecraft with a frozen reddish snowman-shaped object a billion miles beyond Pluto last year suggest the building blocks of planets may have formed less violently than many scientists expected, officials said Thursday.