What to expect from Elon Musk's Mars colonization update this week

On Friday, SpaceX CEO Elon Musk will be giving a "major" update on his plans to colonize Mars during a presentation at the International Astronautical Congress in Adelaide, Australia. His talk is meant to add to the one he gave at last year's IAC conference in Mexico, when he revealed the full architecture of his plans to send thousands of peoples to the Martian surface. This time around, it seems his speech may revolve around making the concept more feasible -- mainly by scaling things down. Mu...