The ExoMars mission to the red planet has been postponed for at least two years.
The European Space Agency (ESA) and Russian state space corporation Roscosmos announced the Rosalind Franklin rover will not be ready for the scheduled launch to Mars in the summer.
Revealing the delay at a video press conference from Paris, ESA director general Jan Woerner said a number of tests still needed to be successfully conducted, but that there would not be enough time before the launch window.
Given that the journey from Earth to Mars can only be attempted when the planets are in specific positions, the next launch date will not be until between August and October 2022.
Professor Woerner said: “After carefully reviewing reports, we have together accepted the advice that launching this year would mean sacrificing essential remaining tests.
“So we have therefore jointly decided, and today confirmed, this decision to move the ExoMars mission to a later launch opportunity, namely 2022.
“This is a very tough decision, but it is, I’m sure, the right one.”
While the outbreak of coronavirus Covid-19 has not directly impacted the launch delay, it has meant the movement of those working on the rover has been limited in recent days.
Prof Woerner explained: “We discussed all these issues before the virus outbreak was as strong as it is right now in Europe, so – and even at that time we said – the probability reduced from day to day.
“So to say it’s coronavirus is the one and only reason, that would be not at all fair.
“But of course now, in this situation, we see that the coronavirus has also an impact on the preparation, because people from different places of industry in Russia, in Italy and France cannot move easily as in the past, so therefore there is also an impact.
“But I would not like to say the coronavirus is the one and only reason, but it has an impact on the mission, yes.”
Named after the British DNA pioneer Rosalind Franklin, the six-wheeled robot will search for life on Mars.
It is equipped with a two-metre drill to take samples from below the surface where they will have been protected from the harsh radiation environment.
Europe’s first planetary rover was assembled at Airbus in Stevenage, in Hertfordshire.
The project, which started in 2005, has waited a long time for completion, facing a number of obstacles along the way.
Now further tests to the spacecraft, with the final hardware and software, are needed.
The latest ExoMars parachutes dynamic extraction tests have been completed successfully at Nasa’s Jet Propulsion Laboratory, and the main parachutes are ready for the two final high-altitude drop tests in March in Oregon, US.
The descent module has been undergoing tests in the the past month.
Meanwhile, the descent module and landing platform have been undergoing environmental testing in Cannes, France, to confirm the spacecraft is ready to endure the harsh conditions of space on its journey to Mars.
The briefing was due to take place in Moscow but the coronavirus outbreak meant it was conducted via video, with Roscosmos director general Dmitry Rogozin unable to join because of technical difficulties.
ExoMars is a joint programme between ESA and Roscosmos, with the primary goal to determine if there has ever been life on Mars.