Elon Musk promises Mars mission in two years

Elon Musk has promised to send a Starship rocket to Mars in two years and build a city there in 20 years. The first flights will be unmanned, and if they are successful, the next step will be sending people. Musk believes that crews will start flying to the Red Planet in four years. The billionaire also noted that for the plan to succeed, the cost of delivering each ton of cargo to Mars needs to be reduced from $1 billion to $100,000: this is a 'challenging but not impossible' task.