Scientists are facing a tense wait to learn the fate of a robot probe that made a historic landing on a comet - but did not stay in place as planned.
Data from the Philae craft indicates it landed at least three times on the comet, after harpoons failed to attach it to the surface on the first attempt.
Philae sent images of the icy grey comet during its approach.
The chief of the European Space Agency said the landing - after a decade-long journey - was a "big step" for humans.
Esa Director-General Jean-Jacques Dordain described it as "a great great day, not only for Esa, but... I think for the world".
Scientists are hoping the probe will analyse the comet's surface to yield insights into the origins of our Solar System more than 4.5 billion years ago.
Esa's Rosetta satellite carried Philae on a 6.4billion-km (4bn-mile) journey to Comet 67P/Churyumov-Gerasimenko.
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- Travelled 6.4 billion km (four billion miles) to reach the comet
- Journey took 10 years
- Planning for the journey began 25 years ago
- More than four billion years old
- Mass of 10 billion tonnes
- Hurtling through space at 18km/s (40,000mph)
- Shaped like a rubber duck
Think of a lump of coal or the briquettes you put on the BBQ - that's what comets would look like if you could stand on their surface. And 67P/Churyumov-Gerasimenko, currently being observed at close quarters by the European Space Agency's Rosetta mission, is no different.
We've joked in recent months about the shape of 67P resembling thosebathtime yellow rubber ducks.