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Sure there are. https://en.wikipedia.org/wiki/Alcubierre_drive#Damaging_effect_on_destination https://en.wikipedia.org/wiki/Alcubierre_drive#Damaging_effe...

• pdonis 10y ago
  > Sure there are. If you include "believed to be impossible" in the definition, I guess.
  • pmoriarty 10y ago
    "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong." -- Arthur C. Clarke
    • pdonis 10y ago
      Thanks for the implicit compliment, but I'm not a distinguished but elderly scientist. :-)