Live coverage: Veteran three-man crew docks with space station

Sierra Nevada and United Launch Alliance have announced the most powerful version of the Atlas 5 rocket, with five strap-on boosters and a twin-engine upper stage, will send the first two Dream Chaser cargo missions to the International Space Station from Cape Canaveral in 2020 and 2021, a schedule that still must be confirmed by NASA.

Blaming a slew of technical snags and “avoidable errors,” NASA officials said Tuesday that the launch of the James Webb Space Telescope, already years behind schedule, will be delayed to 2020, potentially pushing the mission’s development cost above an $8 billion cap mandated by Congress.

A Japanese H-2B rocket fired into orbit Tuesday from the Tanegashima Space Center with an automated cargo freighter loaded with more than 4.1 tons of batteries, experiments, spacewalk equipment, water and provisions for the International Space Station.