[RascalPuff]

"If we did have two universes would they be attracted to one another, since gravity is attractive only?
When they touch alot of pure energy would be created."

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By your leave, Prof:
Since 1996 and accumulatively, more information is stacking up indicating a repelling force acting - simultaneously and 'side by side' - with the 'attractive force of gravity'. (Two vectors acting in opposite directions, more or less balancing each other out) - that was the role of the original innovation of Einstein's formerly abandoned Cosmological Constant - is recently being brought back out of the trash and onto the slate; to account for what's emerging as not only a spatially expanding universe, but an accelerating-expanding universe, where, it seems, the repelling force (Lambda) is slightly overpowering the (alleged) impelling force of gravity. My work interprets this as a physically as well as spatially expanding universe... http:forums.delphiforums.com/EinsteinGroupie

(Gravitons are a purely hypothetical consideration until further notice.)

Regarding the issue of 'touching' universes... We do see some galaxies in collision, whereas none of the ultimate constituents of those galaxies are actually making surface to surface contact. 'Contact' requires surface to surface interaction, and until further notice, ultimately, there ain't no surfaces to be found on 'anything', anywhere (micro or macro).

Of course there's much more to be issued here.
It seems we're throwing a wide loop (and I can see all kinds of options for it to grow even more inclusive), as the venerable Michael has implied.

Best regards,
- RP