Fifteen years after NASA's Opportunity rover touched down on the surface of Mars, scientists fear they may never hear from the spacecraft again.
Opportunity hasn't been heard from since a dust storm on the Red Planet last June. There was so much dust in Mars' atmosphere that sunlight could not reach Opportunity's solar panels to generate power.
"I haven’t given up yet," Cornell University professor Steven Squyres, the mission's principal investigator, told The New York Times. "This could be the end. Under the assumption that this is the end, it feels good. I mean that."
He went on to say that if the storm knocked out the rover for good, "That’s an honorable death."