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

A full-size model of the ExoMars entry, descent and landing module Schiaparelli, with its parachute deployed, was on display in the Netherlands in April. The actual lander is en route to the surface of Mars and set to arrive on Wednesday. ESA hide caption

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ESA

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

A visualization of the polarization of the Cosmic Microwave Background, or CMB, as detected by ESA's Planck satellite over the entire sky. ESA and the Planck Collaboration hide caption

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ESA and the Planck Collaboration

An artist's rendition of the GOCE satellite shows the craft in its orbit around Earth. After four years of studying oceans and gravity fields, GOCE re-entered the atmosphere over the Southern Atlantic Ocean Sunday night. ESA /AOES Medialab hide caption

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ESA /AOES Medialab