1. I. PLOTNIKOV, M2 AMD December 14-th, 2009

2. Prophetic evidences: K. Tsiolkovski (1857-1935) “Earth is the cradle of humanity, but one cannot live in a cradle forever” “Knowledge is strength”

3. Fiction and imagination :  There are a lot of so called « Space Opera» books, sci-fi films about space travels.  2 majestic examples:

4. Why light speed is a problem ?  Time to go to nearest star: about 3 years  Cross the Galaxy: about 30000 years.  Go to Andomeda Galaxy: 10^6 years. Travelling with light speed (upper limit): Relativistic effects : Desynchronization of proper times between the traveler and Earth people.

5. So… « No material body can go faster that light ». But…There are a lot of investigations triyng to bypass this limit.

6. Two main currents:  Space-time distortion (Star Trek current)  Space-time hole: wormholes, Einstein- Rosen bridge (Star Gate current).

7. Distortion: Alcubierre metric Moving in a space-time bubble: warp drive. But: Negative energy density, and need of exotic matter.

8. Whormholes :  Short cuts in space-time.  Needs negative enery to be stable (A.Wheeler 62)  Traversable wormhole metric:  Notion of hyperspace.

9. Two types of wormholes: 1. Intra-universe: link between two points in our universe. 2. Inter-universe: link between two different universes: Einstein-Rosen.

10. Carsac theory of hyperspace: Anti-Universe Universe Anti-Universe No-Space-No-Time Isolation of our « space-time » bubble. Then go to no-space-no-time. Return to our space-time. Travel done.

11. Conclusion : There will be two kind of men: - Those who have a space ship, and those who stay on Earth.