Has the U.S. already discovered alien spaceships? A whistleblower sure thinks we have.

Welcome to This Week in Outer Space, where you’ll find a roundup of the best space coverage from Yahoo News and our partners. This week we’ve got the latest on the search for extraterrestrial life — and a whistleblower report that claims we may have already found it.

Video Transcript

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- There's been a lot of talk about UFOs lately.

- Wow!

- What is it?

- Mysterious balloons popping up in February, a congressional hearing in April.

- This is an example of one that I showed at the hearing recently.

- And last week, NASA held a public meeting to discuss how it studies unidentified anomalous phenomena.

DAN EVANS: The primary objective of this incredible team of experts is not to go back and look at grainy footage of UAPs, but rather to give us a roadmap to guide us for future analysis.

- While none of those events suggested that the US government has any evidence of extraterrestrials that have visited our planet, this week, a whistleblower, who has reportedly held positions in both the National Geospatial Intelligence Agency and the National Reconnaissance Office, alleged that the US not only has evidence of alien activity but has recovered, quote, "intact and partially intact vehicles of non-human origin."

- We have spacecraft from another species?

DAVID CHARLES GRUSCH: We do, yeah.

- How many?

DAVID CHARLES GRUSCH: Quite a number.

- You're kidding.

DAVID CHARLES GRUSCH: No.

- According to reports, whistleblower David Charles Grusch delivered evidence supporting his claims to both Congress and the intelligence community inspector general. And in a statement cleared by the Pentagon, he alleges there are, quote, "multiple agencies nesting UAP activities in conventional secret access programs without appropriate reporting to various oversight committees."

Now, does this mean there is a coordinated effort within the intelligence community to keep the existence of aliens secret? The short answer is no, or at least not necessarily. There are any number of reasons why intelligence agencies and the Department of Defense compartmentalize classified information.

SCOTT BRAY: We do not want potential adversaries to know exactly what we're able to see or understand or how we come to the conclusions we make.

- And even if they do have physical evidence left behind from UAPs, there's a pretty wide gap between not knowing where something's from and, you know, being absolutely sure it's from another planet.

- Must be a space man.

- Still, it's fun to think about. And that's all the time we have for this week. We'll be back next weekend with an all-new "This Week in Outer Space."