The Fermi Paradox Is Our Business Model
"The Fermi Paradox Is Our Business Model" is a science fiction short story by Charlie Jane Anders. It was first published in the online magazine Tor.com August 11, 2010.
Philosophy of physics
Many in the scientific community believe that backward time travel is highly unlikely, because it violates causality i.e. the logic of cause and effect. For example, what happens if you attempt to go back in time and kill yourself at an earlier stage in your life (or your grandfather, which leads to the grandfather paradox)? Stephen Hawking once suggested that the absence of tourists from the future constitutes a strong argument against the existence of time travel— a variant of the Fermi paradox, with time travelers instead of alien visitors.