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Astronomers have released what they say is the best-yet picture of NGC 6744, a spiral galaxy described as a "sibling" of our own Milky Way...

2011-06-01

 galaxy twin Milky Way photography
The 'twin paradox' of special relativity offers the possibility of making interstellar flights within a lifetime. For very long journeys with velocities close to the speed of light, however, we have to take into account the expansion of the universe. Inspired by the work of Rindler on hyperbolic motion in curved spacetime, we study the worldline of a uniformly accelerated observer in de Sitter spacetime and the communication...

2011-06-27

 speed light relativity twin physics space travel