GUADALAJARA: SpaceX chief Elon Musk unveiled on Tuesday ambitious plans to establish a “city” on Mars by sending humans on massive spacecraft with cabins, at a cost as low as $100,000 per person. Taking the stage under a large globe of Mars at the International Astronautical Congress, Musk showed his vision for a giant rocket that would propel men and women to the Red Planet “in our lifetime.” “We need to go from these early exploration missions to actually building a city,” he said to an overflow crowd at an expo center with a few thousand seats in the western Mexican city of Guadalajara. Musk showed a futuristic video depicting his concept of an interplanetary transport system based on re-usable rockets, a propellant farm on Mars and 1,000 spaceships on orbit, carrying about 100 people each. The spacecraft would have a restaurant, cabins, zero-gravity games and movies. “It has to be fun or exciting. It can’t feel cramped or boring,” he said. The first flight would be expensive but the aim is “making this affordable to almost anyone who wants to go,” by dropping the price of a ticket over time to $100,000, Musk said. Experts warn reaching Mars — 225 million kilometers (140 million miles) from Earth on average — and living there requires major engineering feats and a massive budget.