Originally published 2021-07-01.
Yes, he said it, but carefully. In a CNN interview on 28 June 2021, two months into his job as NASA Administrator, former Florida senator Bill Nelson was asked whether humanity is alone. His answer was personal rather than official: "Are we alone? Personally, I don't think we are." He did not say that aliens had visited Earth, and he did not claim the government's newly released report on unidentified objects proved anything about life elsewhere.
That distinction is the whole story. Below is what Nelson actually said, what the intelligence report behind the interview found, where one of his remarks was off, and how NASA approached the subject in the years that followed.
What Nelson told CNN in June 2021
The interview came three days after US intelligence agencies published a short public assessment of reports by military pilots of objects they could not identify. Asked about it, Nelson made two separate points.
First, he spoke about the size of the universe. With billions of galaxies, each holding billions of stars, he found it hard to believe Earth would be the only place where life arose. This is an opinion shared by many scientists, and it is a statement about probability, not evidence.
Second, he spoke about the pilots. He said they had clearly seen something: they had tracked it, locked radar on it and watched it appear to jump from place to place. He noted that the public report counted more than 140 such incidents, and he admitted that nobody yet knew what the objects were.
He also said that, so far, scientists searching the sky had received no signal from an intelligent civilisation. In other words, the head of NASA expressed a belief, acknowledged the absence of proof, and kept the two apart.
The 2021 UAP report in plain terms
The document Nelson was reacting to was the Preliminary Assessment: Unidentified Aerial Phenomena, released by the Office of the Director of National Intelligence on 25 June 2021. Congress had required it. At just nine pages, it summarised the work of the Pentagon's UAP Task Force.
- 144 observations were reviewed, almost all reported by US Navy personnel between 2004 and 2021.
- Only one was explained with high confidence: a large balloon that was losing air.
- 18 incidents involved objects that seemed to hover in the wind, move against it, turn abruptly or travel fast with no visible propulsion.
- 11 cases were near misses in which pilots said they had to manoeuvre to avoid an object.
The report sorted possible explanations into five bins: airborne clutter such as balloons, drones, birds and plastic bags; natural atmospheric effects such as ice crystals; secret US government or industry projects; systems built by foreign rivals such as China or Russia; and a final "other" category for anything that might need new science to explain.
Crucially, it found no evidence that any object was extraterrestrial, though it did not formally rule that out. Most commentators called the report inconclusive. Senators Mark Warner and Marco Rubio described it as a first step, and the Deputy Secretary of Defense ordered better reporting procedures.
Why "unexplained" does not mean "alien"
It is tempting to read "143 of 144 unexplained" as a sign that something extraordinary is happening. It is better read as a statement about missing data. Many incidents were recorded by sensors built to track aircraft, not to measure the size, distance or speed of a small object against a moving background. When the data are thin, an object cannot be identified, and the honest answer is "we don't know."
Sceptics such as the investigator Mick West argued at the time that apparent impossible speeds can come from camera artefacts, parallax and misjudged distance. A balloon a few kilometres away can look like a distant craft moving at incredible speed if the observer assumes the wrong range.
That is also why Nelson's comment about speeds that exceed known technology needs care. The report described objects that appeared to move in unusual ways; it did not establish that they actually did. Appearance and measurement are different things.
A correction: NASA's SETI programme
In the interview Nelson referred to a NASA programme dedicated to the search for extraterrestrial intelligence. That was not quite accurate in 2021. NASA's radio search, the Microwave Observing Program, was funded in 1992 and cancelled by Congress about a year later. Since then the best-known searches have been privately funded, for example by the SETI Institute in California and the ten-year, $100 million Breakthrough Listen project launched in 2015 at UC Berkeley.
NASA has, however, returned to the topic under a different name. In June 2020 it awarded its first SETI-related grant in about three decades, for work on "technosignatures": signs of technology, such as pollution in an alien atmosphere, that might be spotted by telescopes. So the spirit of Nelson's remark was right, even if the programme he described no longer existed in that form.
What NASA did next
NASA's main contribution to the search for life is not chasing UFO reports but studying places where life could exist. Rovers on Mars look for chemical traces of ancient microbes, missions are planned to icy moons such as Europa, and space telescopes analyse the atmospheres of planets around other stars.
Still, Nelson's tenure did bring the agency into the UAP debate. On 9 June 2022, NASA announced an independent study team to look at unidentified anomalous phenomena from a scientific angle: what data exist, how better data could be collected and how NASA's expertise could help. The team held a public meeting on 31 May 2023 and published its final report on 14 September 2023, with recommendations on improving how such events are observed and recorded. Nelson served until 20 January 2025.
Who Bill Nelson is
Nelson was confirmed by the Senate without opposition on 29 April 2021 and sworn in by Vice President Kamala Harris on 3 May 2021. He is one of the few NASA chiefs who has flown in space himself. In January 1986, as a sitting congressman, he spent six days aboard Space Shuttle Columbia on mission STS-61-C, landing just ten days before the Challenger disaster. He later represented Florida in the US Senate from 2001 to 2019.
That background helps explain his tone. He spoke as someone who had seen Earth from orbit and was willing to share a personal belief, while relying on the report's own conclusion that the evidence was not there.
The takeaway
If you came here wondering whether NASA's leader confirmed aliens: he did not. He offered a widely held scientific hunch that life probably exists somewhere in a vast universe, and he agreed that military pilots saw things nobody could yet identify. Those are two different claims, and neither one shows that an alien spacecraft has been detected.
The useful habit, for headlines about UFOs or anything else, is to ask three questions: who said it, in what capacity, and what evidence was offered. Here the answers are a newly appointed administrator, speaking personally, and no evidence of extraterrestrial life at all.
Sources: CNN interview, 28 June 2021; ODNI, Preliminary Assessment on UAP; Wikipedia: Preliminary Assessment; NASA: UAP Independent Study; Wikipedia: SETI; Wikipedia: Technosignature; Wikipedia: Bill Nelson; Futurism.
COMMENTS