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Artist's depiction shows the separation of the Schiaparelli lander from the Trace Gas Orbiter (left) as it heads for the surface of Mars. European Space Agency via AP hide caption

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European Space Agency via AP

A visualization shows what the European Space Agency hopes Schiaparelli's Mars landing looks like. The probe will be making its six-minute descent through the atmosphere on Wednesday. M.Thiebaut/ESA-ATG medialab hide caption

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M.Thiebaut/ESA-ATG medialab

An illustration of Rosetta just before Friday's expected landing on the comet known as 67P/Churyumov-Gerasimenko. The final approach aims to be only at "walking speed," mission specialists say, but that's enough to tip the antenna away from Earth. ATG medialab/ESA hide caption

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ATG medialab/ESA

Scientists To Bid A Bittersweet Farewell To Rosetta, The Comet Chaser

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Photos taken on Friday, from more than a mile and a half from the comet, show Philae's three-foot-wide body and two of its three legs. The April 2015 image on the top right shows the comet overall, with the approximate location of Philae marked with a red dot. Main image and lander inset: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; context: ESA/Rosetta/ NavCam hide caption

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Main image and lander inset: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; context: ESA/Rosetta/ NavCam

The Joint European Torus, a European fusion project in the U.K., gets most of its funding from the EU. Brexit may change that, and the even larger ITER fusion project. EUROfusion hide caption

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EUROfusion

Close-ups of a curious surface texture on Comet 67P nicknamed "goosebumps," all of them at a scale of around 3 meters and spanning areas more than 100 meters. ESA/Rosetta/MPS hide caption

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ESA/Rosetta/MPS

The Rosetta spacecraft, which orbits the comet, captured this series of images of the Philae lander bounding off the surface. The precise spot the lander came to a stop remains unknown. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA hide caption

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Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

The ESA released this composite panoramic image showing Philae's surroundings on Comet 67P. To illustrate the lander's orientation, the agency superimposed a sketch of the craft. ESA Rosetta/Philae/CIVA hide caption

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ESA Rosetta/Philae/CIVA