SpaceX has launched the biggest and most powerful rocket ever made in a landmark test - but it exploded just minutes later.
Three days after an inaugural flight was scrapped due to a last-minute glitch, Starship took off from Boca Chica in southern Texas as thousands of spectators watched nearby.
Live updates from landmark SpaceX launch
But the rocket system failed to separate as planned, and exploded less than four minutes into its flight.
SpaceX said Starship experienced a "rapid, unscheduled disassembly before stage separation".
SpaceX officials still declared the ambitious mission a success, as it marked the first time Starship and its massive booster rocket had taken to the skies.
Company boss Elon Musk congratulated the team on an "exciting test launch".
Musk had sought to keep expectations in check beforehand, saying it had a 50% chance of reaching orbit.
But more launches are planned, and he believes there's an 80% chance of success before the end of the year.
"Learned a lot for next test launch in a few months," Musk tweeted after Thursday's test.
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Starship launch a major step forward despite explosive finale
Tom Clarke
Science and technology editor
Seeing Starship fly 39km into the atmosphere, only failing at the point the upper stage was supposed to separate from its Super Heavy booster, was beyond SpaceX's expectations - though perhaps not their hopes.
This was the first time the Super Heavy booster has ever flown. Before launch, success for this mission would have been it clearing the launchpad.
It managed to do that and a lot more. About 55 seconds into the flight, it passed a point called max Q, the point where forces on the spacecraft are at the highest before it enters the less dense upper atmosphere.
Achieving that is an important validation of this rocket's design and construction.
That's why instead of cries, there were cheers when, after tumbling over and over in the stratosphere, Starship blew up. Or experienced a "rapid, unscheduled disassembly" in the words of SpaceX.
SpaceX boss Elon Musk was in the control room for launch. It's fair to say he didn't look thrilled when Starship failed to separate.
But he will know today was a major step forward in his efforts to build a rocket big enough to one day take people to the Moon, and Mars.
And, with the successful launch of the world's biggest ever rocket, a moment in space history.
After all, it was Musk who once said: "If things are not failing, you are not innovating enough."
SpaceX's record-breaking rocket
Starship is made up of two stages - a Super Heavy booster that generates the needed power to reach orbit, and the spacecraft tipped to one day take humans back to the moon and eventually Mars.
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Combined, the craft and booster - which has 33 rocket engines - have a record-setting height of 120m.
It was hoped Thursday's test would see the craft separate from the booster and complete a full orbit of the Earth.
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What might have been…
If completely successful, Starship would have completed a full orbit of the Earth and splashed down into the Pacific.
The booster - a prototype called Booster 7 - would have been discarded into the Gulf of Mexico.
The whole flight would have taken about 90 minutes.
Thankfully, there was no cargo aboard Starship for Thursday's launch, let alone people.
Be the first to get Breaking News Install the Sky News app for freeMusk hopes Starship will eventually be used to carry satellites into space - and take humans to the moon and Mars.
NASA has signed up to use it to transport astronauts back to the lunar surface via its Artemis programme by 2025.
Starship's first orbital test comes after the US flight regulator issued SpaceX with a five-year licence, saying it met all safety and environmental requirements.
