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On June 25, 2021, the Office of the Director of National Intelligence released a much-anticipated . The military has rebranded unidentified flying objects as unidentified aerial phenomena—UAPs—in part to avoid the stigma that has been attached to claims of aliens visiting the Earth since the . The report presents no convincing evidence that alien spacecraft have been spotted, but some of the data defy easy interpretation.

I'm a who has written extensively on the in the universe. I also teach a . I do not believe that the new government report or any other sightings of UFOs in the past are proof of aliens visiting Earth. But the report is important because it opens the door for a serious look at UFOs. Specifically, it encourages the U.S. government to collect better data on UFOs, and I think the release of the report increases the chances that scientists will try to interpret that data. Historically, UFOs have felt off limits to mainstream science, but perhaps no more.

What's in the UFO report?

The No. 1 thing the report focuses on is the lack of high-quality data. Here are the highlights from the , covering a total of 144 UAP sightings from U.S. government sources between 2004 and 2021:

"Limited data and inconsistent reporting are key challenges to evaluating UAP."

Some observations "could be the result of sensor errors, spoofing, or observer misperception."

"UAP clearly pose a safety of flight issue and may pose a challenge to U.S. national security."

Of the 144 sightings, the task force was "able to identify one reported UAP with high confidence. In that case, we identified the object as a large, deflating balloon. The others remain unexplained."

"Some UAP many be technologies deployed by China, Russia, another nation, or non-governmental entity."

UFOs are taboo among scientists

UFO means unidentified flying object. Nothing more, nothing less. You'd think scientists would enjoy the challenge of solving this puzzle. Instead, UFOs have been taboo for academic scientists to investigate, and so unexplained reports have not received the scrutiny they deserve.

One reason is that most scientists think there is , and the few who have dug deeply have mostly . to meteors, fireballs and the planet Venus.

Another reason for the scientific hesitance is that UFOs have been co-opted by popular culture. They are part of a landscape of conspiracy theories that includes accounts of and . Scientists worry about their professional reputations, and the association of UFOs with these supernatural stories causes most researchers to avoid the topic.

But some scientists have looked. In 1968, Edward U. Condon at the University of Colorado published the . The Condon Report put a damper on further research when it found that " that has added to scientific knowledge."

However, a by a panel led by Peter Sturrock, a professor of applied physics at Stanford University, concluded that some sightings are accompanied by physical evidence that deserves scientific study. Sturrock also and found that nearly half thought UFOs were worthy of scientific study, with higher interest among younger and more well-informed astronomers.

If astronomers are intrigued by UFOs—and believe some cases deserve study with academic rigor—what's holding them back? A between ufologists and scientists hasn't helped. And while UFO research has employed , it has not had the core of skeptical, evidence-based reasoning that demarcates science from .

A search of 90,000 recent and current by the National Science Foundation finds none addressing UFOs or related phenomena. I've served on review panels for 35 years, and can imagine the reaction if such a proposal came up for peer review: raised eyebrows and a quick vote not to fund.

A decadeslong search for aliens

While the scientific community has almost entirely avoided engaging with UFOs, a much more mainstream search for intelligent aliens and their technology has been going on for decades.

The search is motivated by the fact that astronomers have, to date, discovered . Called exoplanets, some are close to the Earth's mass and at just the right distance from their stars to potentially have water on their surfaces—meaning they might be habitable.

Astronomers estimate that there are in the Milky Way galaxy alone, and each one is a for life to develop and for intelligence and technology to emerge. Indeed, most astronomers think it very unlikely that .

This confidence has fueled an active , known as SETI. It has been unsuccessful so far. As a result, researchers have recast the question "Are we alone?" to "Where are the aliens?" The absence of evidence for intelligent aliens is called the . First articulated by the physicist Enrico Fermi, it's a paradox because advanced civilizations should be spread throughout the galaxy, yet we see no sign of their existence.

The SETI activity has not been immune from scientists' . It was starved of federal funding for decades and recently has gotten most of its support from . However, in 2020, NASA , and the new NASA administrator wants researchers to .

In this context, the intelligence report is welcome. The report draws about UFOs and avoids any reference to aliens or extraterrestrial spacecraft. However, it notes the importance of destigmatizing UFOs so that more pilots report what they see. It also sets a goal of moving from anecdotal observations to standardized and scientific data collection. Time will tell if this is enough to draw scientists into the effort, but the transparency to publish the report at all reverses a long history of .

I don't see any convincing evidence of alien spacecraft, but as a curious scientist, I hope the subset of UFO sightings that are truly unexplained gets closer study. Scientists are unlikely to weigh in if their skepticism generates attacks from "true believers" or they get ostracized by their colleagues. Meanwhile, the truth is still out there.

This article has been updated to clarify that the report was produced by the Office of the Director of National Intelligence.

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