The declassifying of military UFO reports by the United States will open a window into new physics and science, an Australian astrobiologist says, even if he finds it "highly unlikely" extraterrestrial entities are visiting Earth.

This week the US Office of the Director of National Intelligence (ODNI) released its much-anticipated preliminary assessment into what it calls Unidentified Aerial Phenomena (UAP).

With its release came the admission that all but one of 144 recorded events between 2004 and 2021 were unexplained.

The assessment included incidents of military pilots tracking UAPs, with footage of some encounters having been declassified and released in recent years.

"As soon as you take these out of the top-secret locker and make them public, you suddenly open them up to scrutiny of a much wider variety of people with very different expertise," University of Southern Queensland's Centre for Astrophysics' Professor Jonti Horner said.

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