How do I stop the pyramid

Hint 1 of 10:

Something is stopping you.

Hint 2 of 10:

And you have no choice other than harming it.

Hint 3 of 10:

You have to SHOOT FLOYD.

Hint 4 of 10:

Have you translated the message in the alien ship?

Hint 5 of 10:

It tells you what will kill pyramids.  Go back and read it.

Hint 6 of 10:

Element #78 is exactly that thing.

Hint 7 of 10:

In case you don't have a periodic table, platinum is it.