Time
While
riding on a streetcar Einstein looked up at a clock tower and it all clicked.
If
wormholes existed, they would be smaller than
atoms. If we want to go
through them, it would take a tremendous amount of
energy. Not just
ordinary energy, something called negative energy.
Negative energy is
anti-gravitation. It repels the fabric of
space and time and would prevent
gravity from crushing a wormhole.