In early 2005, Mars Express, a European Space Agency orbiter, discovered evidence of kieserite in patches of Valles Marineris (the largest canyon on Mars), along with gypsum and polyhydrated sulfates.
::Mars Express performs the closest flyby to date of Phobos
Mars | American Express | Veronica Mars | Daily Express | The Mars Volta | Bruno Mars | Thirty Seconds to Mars | Mars, Incorporated | Pony Express | Orient Express | Von Ryan's Express | Murder on the Orient Express | Mars (mythology) | Express | Mars Science Laboratory | Mars Exploration Rover | The Express | DHL Express | Starlight Express | Intercity-Express | express train | United Express | Regional Express Airlines | Regional-Express | Mars trilogy | Mars Pathfinder | Express News | Continental Express | Champ de Mars | An Anthropologist on Mars |
The B-side "Beagle 2", was sent aboard Beagle 2, an unsuccessful British landing spacecraft that formed part of the European Space Agency's 2003 Mars Express mission.