[RadioAstronomer]

There will also be an examination of the different types (isotopes) of hydrogen and oxygen atoms that make up the water.

This will be very "telling"!

[Moonman62]

This is an old article. The results should already be known.

[ApplegateRanch]

What are the chances that this is a piece of Earth that was "splashed" into orbit by an ancient asteroidal impact, and finally its orbit brought it back?

Enough velocity to escape, but oribital elements tying it to the earth-moon gravitational system?

[Moonman62]

Using radioisotope dating, scientists at the University of Manchester and the Natural History Museum in London determined that the salt crystals probably formed within about two million years of the solar system's birth. If this age is correct, it means that the dust, gas, and ice swirling around the newborn sun clumped together into rocky fragments far more quickly than researchers have assumed. These fragments were the parent bodies for primitive meteorites like Zag and the essential building blocks for asteroids and planets

Entire article here.