The hardest part of discovering alien life may be announcing it. Here's how NASA might break the news.

• NASA's James Webb Space Telescope detected a possible sign of alien life on a distant planet.
• Alien life has still not been confirmed through science or through studying UFOs (or UAPs).
• NASA's greatest challenge could be explaining any alien discovery to the public.

NASA is not announcing the existence of extraterrestrial life.

The James Webb Space Telescope has detected a possible sign of it, though.

On Wednesday, a peer-reviewed study reported new observations of a possibly ocean-covered planet called K2-18 b, about 120 light-years from Earth. Webb had detected an abundance of a molecule that, on Earth, is only known to come from living organisms like algae.

The discovery is intriguing, but it's not a smoking gun for alien life. A lot of additional research is necessary to rule out non-biological sources of that signal.

If scientists ever break alien-life news, though, the world may have trouble understanding.

Just look at the last few years of UFO mania — or, rather, mania about "unidentified anomalous phenomena," or UAP. (That's the government term for the mysteries most people call UFOs.)

Remember the "Chinese spy balloon" that the Pentagon shot down in 2023?

Suddenly, the US seemed to be spotting mysterious flying "objects" everywhere, and US fighter jets gunned down three more in the skies over Alaska, Canada, and Lake Huron. Even Elon Musk weighed in with an alien joke.

Then, last year, there were the "drones." Starting in New Jersey, reports of nighttime UAP sightings spread across the East Coast and then the entire country, prompting wild speculation and more than 5,000 tips to the FBI.

Observers and enthusiasts have also expressed their feelings about aliens to NASA's independent UAP study team, which concluded in 2023 that there is no evidence UAP have extraterrestrial origins.

Throughout their study, the team faced "nasty and hostile" online harassment, in the words of David Spergel, president of the Simons Foundation and chair of the team.

The harassment and threats were so bad, officials said, that they initially declined to share the name of NASA's top UAP official.

These breathless rumors and hostile messages are just a peek at what scientists and NASA leaders might face if they ever discover true evidence of life beyond Earth.

"You can't overstate just how important that discovery would be. How we're going to confirm that and announce it responsibly, I think is a really, really important question," Lori Glaze, who was leading NASA's planetary science division at the time, told Business Insider at the American Geophysical Union's meeting in 2022.

"The biggest challenge is trying to keep that communication on an even keel, right? With an excitement, and yet also understanding that we need to set the expectations that we have to follow the scientific process."

How NASA scientists might explain any alien findings — gradually

Maybe the James Webb Space Telescope detects a telltale molecule in the atmosphere of a distant Earth-like planet. Maybe Mars samples from the Perseverance rover reach Earth in a decade, and scientists find fossils of ancient microbes inside them.

Many astrobiologists (exactly what it sounds like — people who study the idea of biology beyond Earth) think that evidence of extraterrestrial life could turn up soon.

However, it's unlikely that any evidence would be completely, irrefutably, obviously aliens. Scientists will probably disagree, and won't be 100% confident. That could be hard to explain to the public.

"This is going to be a very, very hard thing to actually get the scientific community, I think, to agree upon — unless we actually see something moving around and waving at us, which is unlikely," Glaze told BI.

That's why NASA has tried to develop a procedure for assessing and sharing such a monumental, sensitive discovery. The conversation is ongoing, Glaze said, but in 2021, the agency published a framework as a starting point. It could help scientists, journalists, and NASA itself explain the science.

It's called the "confidence of life detection" (CoLD) scale, rating scientific confidence in any potential alien-life discovery on a scale of one to seven. A possible detection can climb to higher levels of confidence as evidence builds.

For example, a level one detection might be the discovery of a molecule that could be related to life inside a Perseverance Mars sample. The evidence would graduate to level two once scientists confirm there was no contamination in the sample, or the instruments involved, that could have influenced their findings. By ruling out non-biological sources of the molecule, or by confirming that it came from an environment suitable for life, scientists could move it further up the scale.

Other scientific teams would have to measure the Mars sample themselves, with different methods, and confirm the initial finding to graduate to level six.

According to NASA, in this Mars molecule example, additional evidence from a different part of the red planet may be necessary to bring it up to level seven — where it's probably life.

Each new level of confidence could mean a new public announcement.

The discovery of extraterrestrial life is likely to be a slow build-up, rather than an explosive eureka moment.

"Until now, we have set the public up to think there are only two options: it's life or it's not life," Mary Voytek, head of NASA's Astrobiology Program, said in a press release when the new scale was published. "We need a better way to share the excitement of our discoveries, and demonstrate how each discovery builds on the next, so that we can bring the public and other scientists along on the journey."

The president or other countries could be involved in announcing that extraterrestrial life exists

Announcing the existence of alien life would be an "administration-level" affair, Glaze said, referring to the US presidency. It wouldn't just be NASA explaining itself at press conferences.

NASA might not even be the first entity to discover evidence of life on another planet. Another nation's space agency could find it first.

The discovery ofintelligentalien life would be even more Earth-shattering. That would come with its own conundrums: How do we communicate with them? What do we say? And how might they respond?

Even beaming little hints of ourselves into the void has been controversial. In 1974, astronomers sent out radio signals containing the numbers one through 10, information about the composition and structure of DNA, a figure of a human and our global population, and a graphic of the solar system with Earth highlighted.

Critics like Stephen Hawking have said that contacting any extraterrestrial intelligence could pose an existential risk for humanity.

Needless to say, any discovery of alien life would likely lead to chaos — at least in public discourse.

Glaze said NASA's goal is to be a trusted, transparent source of clear scientific information. It could be the agency's biggest challenge yet.

"I'm not sure we even have words to describe it," she said. "The confirmation that we're not alone in the universe is, I think, going to be akin to realizing that the universe doesn't rotate around Earth. It's a very different way of thinking about who we are, where we came from."

This post has been updated to include new events. It was originally published on February 18, 2023.

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