The red planet has space fans red hot with anticipation.
NASA said it will announce Monday that a Mars mystery has been "solved," but did not say what the mystery was, only that it "detail a major science finding."
— NASA (@NASA) September 26, 2015
"I suspect it's going to be something that will increase our interest in going to Mars," former astronaut Mike Massimino said.
Speculation on social media about what the announcement might be included aliens and water on the planet. Massimino said that if the announcement is that there is water, that could have great significance.
"That there is some sort of life form that might be discovered, and it's also the possibility that you could support human life there," Massimino said.
Since 2006, scientists have been taking a closer look at water on Mars. Earlier this year there were talks that the Mars rover spotted an ancient lake bed.