Space Force launch: Robotic rocket plane blasts off on secret mission

Launch is dedicated to medical staff and first responders fighting the coronavirus pandemic

The US Space Force has launched a robotic space plane on a secret mission in Earth's orbit. The blast-off, on Sunday morning, came after a 24-hour delay caused by bad weather conditions.

The X-37B plane was launched on an Atlas 5 rocket from Cape Canaveral in Florida.

Space Force officials said they were dedicating the launch to the nation's first responders and medical personnel fighting the coronavirus pandemic.

Secretary of the Air Force Barbara Barrett said in a statement: "Our invincible American spirit drives us to motivate, collaborate, and innovate together to overcome adversity.

"In dedicating this mission to the nation's healthcare workers, first responders, and essential personnel, the Department celebrates those who are keeping America Strong."

The launch is the second for the US Space Force since it was established in December last year. The first was for a Advanced Extremely High Frequency-6 satellite on an Atlas 5 that took place on 26 March.

The X-37B mission will undertake a series of experiments while in orbit.

While much of the intent of the mission has been shrouded in secrecy, the Space Force has revealed that the experiments will include studying the results of radiation and other space effects on seeds used to grow food.