By: Mike Wall
Published: 08/04/2012 09:18 AM EDT on SPACE.com

If NASA's newest Mars rover doesn't touch down safely Sunday night (Aug. 5), the future of Red Planet exploration could be thrown into serious doubt.

The 1-ton Curiosity rover's main goal is to determine if Mars can, or ever could, support microbial life. But the huge robot is also carrying the hopes and dreams of NASA's venerable Mars program on its back to some extent, so a crash Sunday night could be devastating.

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PHOTOS: 11 Embarassing Moments For NASA, ESA & Other Space Agencies

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  • Liberty Bell 7 Sinks

    After the second manned space mission in 1961, the Liberty Bell 7 capsule was afloat in the Atlantic ocean, awaiting recovery. Astronaut Gus Grissom reported that he heard a dull thud as the hatch blew open--the module began filling with water, and Grissom had to struggle to escape before it sank. Did Grissom "screw the pooch," as Tom Wolfe famously wrote in <i>The Right Stuff</i>? Or was there a mechanical malfunction? The world may never know.

  • Phobos-Grunt Disintegrates

    Phobos-Grunt was a 2011 Russian mission to return a sample of soil from Mars' moon Phobos. It would have been the first such sample ever returned to earth. Because of a malfunction in the craft's propulsion system, however, Phobos-Grunt never made it out of low-earth orbit. It remained there, crippled, until early 2012, when its orbit decayed and it disintegrated in the atmosphere off the coast of Chile.

  • Mars Climate Orbiter Burns Up

    This 1998 orbiter mission was supposed to study Mars' climate history and determine if the planet ever held life-sustaining water. But the $125 million craft never made it to Mars, burning up in the atmosphere on the day it was supposed to enter orbit. What caused the costly incident? One team of engineers had performed their calculations in metric units, while another used English units.

  • Soyuz 5 Lands Hard

    After participating in the first in-flight transfer of cosmonauts from one spacecraft to another, pilot Boris Volynov (pictured), led Soyuz 5 back toward Earth. When the service module failed to detach, the craft plummeted toward earth upside-down, subjecting Volynov to extreme heat. The craft subsequently crashed hundreds of miles off course in the Ural mountains, breaking several of Volynov's teeth in the impact and leaving him to awaiting rescue in -38 degree (F) temperatures. He walked "a few kilometers" to a village and took shelter until help arrived. (<a href="http://www.wired.com/science/discoveries/news/2009/01/dayintech_0116">Source</a>)

  • Hubble Telescope Can't See

    Although NASA's Hubble Space Telescope has produced incredible images of space for more than 20 years, it was nearly a failure of galactic proportions. After its launch in 1990, Hubble produced only blurry, grainy pictures due to a faulty mirror. Luckily, it was fixed three years later, and went on to capture some of the most incredible space images ever seen.

  • Kwangmyŏngsŏng Program Flounders

    North Korea has attempted to launch its Kwangmyŏngsŏng satellites four times, and met with four failures. North Korean Umha-2 rockets, pictured, were used on the second and third launches but could not bring their satellite payloads into orbit. Fortunately, all the missions were unmanned.

  • H-IIA Rocket Self-Destructs

    H-IIA is the launch system of the Japanese Aerospace Exploration Agency (JAXA). Its sixth launch was supposed to deliver a spy satellite into orbit, but a rocket booster failed to detach properly from the H-IIA, making the rocket too heavy to enter orbit. Ground control sent a destruct command to the rocket shortly after.

  • Glory Sputters Out

    Climate science was dealt a blow in March 2011, when NASA's Glory satellite--which was supposed to study humans' effect on the Earth's atmosphere--failed to launch. The Taurus XL rocket carrying the observation satellite crashed into the Pacific after liftoff when Glory's protective casing didn't open.

  • Cluster Breaks Up

    Cluster, a group of spacecraft launched by the European Space Agency (ESA) in 1995, were lost when launch vehicle Ariane 5 failed to reach orbit. The launch vehicle, on its maiden voyage, self-destructed after a software error caused it to veer off-course. What was the problem? A glitch similar to the issue that doomsayers said would bring disaster at 11:59:59, December 31, 1999. This time, however, the threat was real.

  • Apollo 13 'Fails Successfully'

    NASA's most famous black eye came on April 14, 1970, when an oxygen tank on Apollo 13's service module exploded and the crew narrowly managed to abort the mission safely. The damaged service module that began the drama is pictured here, courtesy of <a href="http://www.alanbeangallery.com/">Alan Bean</a>, Apollo astronaut and "first artist on another world."

  • Naro-1 Sputters

    Naro-1 was a carrier rocket created for South Korea's Korean Aerospace Research Institute. Both attempts to launch Naro-1 ended in failure, with one disintegrating in the atmosphere and another exploding before making it to space.

"It could take the entire Mars program down with it," Robert Zubrin, president of the Mars Society, which pushes for human settlement of the Red Planet, told SPACE.com's Leonard David. "It is victory or death."

Big funding cuts

President Barack Obama's 2013 federal budget request, which was released in February, slashes NASA's planetary science program funding from $1.5 billion to $1.2 billion, with further cuts expected in the coming years.

Much of the money will come out of NASA's robotic Mars exploration program, which has enjoyed a string of successes in the past decade. After landing in January 2004, for example, the twin rovers Spirit and Opportunity discovered plenty of evidence that Mars was once warmer and wetter than it is today. And the Phoenix lander found subsurface water ice near the planet's north pole in 2008.

Nevertheless, the White House budget proposal cuts NASA's Mars funding from $587 million this year to $360 million in 2013, and then to just $189 million in 2015. [NASA's 2013 Budget: What Will It Buy?]

As a result, NASA was forced to drop of out the European-led ExoMars mission, which aims to deliver an orbiter and a rover to the Red Planet in 2016 and 2018, respectively. And the agency is fundamentally restructuring and downscaling its Mars program, in an attempt to figure out how to make the most out of every precious dollar.

But NASA planetary science officials still hold out hope for a funding comeback, with the help of Curiosity. They think the rover's discoveries could loosen politicians' pursestrings and reinvigorate the agency's robotic exploration efforts.

"What a tremendous opportunity it is for us," Jim Green, head of NASA's planetary science division, said at a conference in March. "I believe [Curiosity] will open up that new era of discovery that will compel this nation to invest more in planetary science."

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WATCH: Mars Rover Landing: The Personal Side

Sticking the landing

So a successful landing on Sunday night is of paramount importance to the space agency, officials have said.

Curiosity's touchdown "could arguably be the most important event -- most significant event -- in the history of planetary exploration," Doug McCuistion, director of NASA's Mars Exploration Program, said last month.

But success is not a given. Landing a robot on another planet is never an easy task, and Curiosity's touchdown will perhaps involve more hand-wringing than usual.

Because it's so heavy, engineers had to devise an entirely new landing method for the rover. A rocket-powered sky crane will lower Curiosity to the Martian surface on cables, then fly off to intentionally crash-land a short distance away. Such a maneuver has never before been tried on another world.

If success over the course of the mission could bring great dividends to NASA's Mars program, then failure Sunday night could have a chilling effect. [How Curiosity's Nail-Biting Landing Works (Pictures)]

"I think if we are fatal on landing, that will have a very negative influence," said Caltech's John Grotzinger, lead scientist for Curiosity's $2.5 billion mission, which is officially called the Mars Science Laboratory (MSL).

"It's going to force people to look back and ask if it's possible to achieve these very complex, more demanding missions from a technological perspective," Grotzinger told SPACE.com. "How can you talk about sample-return if you can't do MSL first?"

Keeping the program vital

NASA has one more Mars mission firmly on the books beyond MSL, an atmosphere-studying orbiter called Maven that's due to launch next year. The agency plans to launch another mission in 2018 or 2020, partly to keep the program vital.

But a Curiosity crash could persuade some talented scientists and engineers that there's not much of a future at Mars, at least not for a while, researchers say.

"If this thing were to fail, I think a lot of people would trickle away and do other things," said Ken Edgett, of Malin Space Science Systems in San Diego. Edgett is principal investigator for Curiosity's Mars Hand Lens Imager instrument, or MAHLI.

He added that a crash might spark discussions within NASA about shifting resources from Mars to other promising destinations, such as Jupiter's moon Europa, which harbors a liquid-water ocean beneath its icy shell.

"I don't like that either-or scenario, but I think that's where we're headed," Edgett told SPACE.com in April.

Mars keeps calling us

Edgett stressed, however, that he didn't think a landing mishap would be the end of the Mars program. Other experts echo that viewpoint, saying that Mars will continue to hold our interest and draw our scientific explorers back.

"It's one of the most scientifically compelling objects in the solar system -- perhaps in terms of ease to get to, the most compelling," said Scott Hubbard of Stanford University. "And it's the place, ultimately, for human exploration. So I think Mars exploration will continue."

Hubbard speaks from experience. He's the former "Mars Czar" who restructured NASA's Red Planet program after the agency's Mars Polar Lander and Mars Climate Orbiter both failed in 1999.

Still, success would definitely be preferable for those who care about Red Planet exploration. A strong showing by Curiosity could lead to bigger things down the road at Mars, Hubbard said.

"There's a window, I feel, with a successful mission -- particularly if it finds evidence of organics -- to give the scientific community even more stimulus and ammunition to ask for a re-look at the budget," Hubbard said.

SPACE.com columnist Leonard David contributed to this story. Visit SPACE.com for complete coverage of NASA's Mars rover landing Sunday. Follow senior writer Mike Wall on Twitter @michaeldwall or SPACE.com @Spacedotcom. We're also on Facebook and Google+.

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