This can then be used to estimate the size of unknown elements in the panel.

But actually we want to find out what unknown elements may be floating around in space.

Now, though, there is an unknown element hanging over Indy.

We have identified seven elements previously unknown to our science.

During the show, many of the unknown elements of his life were revealed and made public.

The unknown element of the meetings, though, is which group will push the hardest.

And, as was always the case with unknown elements, perhaps more dangerous.

I tell you, he's an unknown element that has to be handled when and where he enters.

Here was his chance to test the unknown element.

Always there is the unknown element to take into consideration.