Weba nasa probe into hundreds of ufo sightings found there was no evidence aliens were behind the unexplained phenomena, but the space agency also could not.

Webfrom a waterfall that disappears into nowhere to odd jelly blobs that fall from the sky, the mechanics behind these natural phenomena are some of nature's best kept.

Add in suspect weather,.

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Some are due to.

Government report on ufos says it found no evidence of aliens but acknowledged 143 reports of unidentified aerial phenomena since 2004 that could not.

But in doing so they have run up against two bigger mysteries, including one.

Maybe it's strange hexagonal clouds acting as air.

17 astounding scientific mysteries that researchers can’t yet solve.

What is the universe made out of?

Artificial intelligence decodes ancient texts written in forgotten scripts.

Weban australian scientist says probabilities are the leading cause of the bermuda triangle disappearances.

Webevery few years, a story goes viral claiming that experts have finally 'solved' the bermuda triangle mystery.

Webpaleogenetics teases out astonishing secrets from dna hidden in bones and dirt.

And he’s not the only one.

Webresearchers have discovered the cause of the brightest burst of light ever recorded.

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Webin exploring these stories, we’ve learned some of the surprising reasons why major scientific mysteries can go unsolved for years or even decades:

How should we define death?