According to Musk, colonizing Mars won't be easy.

In a video interview with Chris Anderson, Musk said that Mars will not be luxurious in the beginning.

The billionaire compared recruitment efforts for Mars to an ad from the 1900s for an expedition to Antarctica. The ad called for men to go on a hazardous journey and said a safe return was questionable.

The sales pitch for going to Mars is cramped and dangerous. You might not make it back. It is hard work, Musk said.

It would be more difficult to live on Mars, a planet with an average temperature of -80 degrees Fahrenheit, than it would be to live in Antarctica, a region with an average temperature of -70 degrees Fahrenheit.

There are volcanoes and canyons on Mars. The planet has one-third the gravity of Earth and a thinner atmosphere. A human without special equipment would die on the planet due to the low atmospheric pressure.

Musk wants to build a city on Mars. It would take one million tons of cargo to build a city on the planet, according to Musk.

Anderson was told by the billionaire that he hopes the people that colonize Mars will rethink society.

It is important for maximizing the probable life span for humanity or consciousness, according to Musk.

Anderson was told by the richest man in the world that the price of future rockets to Mars would be relatively affordable for most people.

The city will be self-sufficient in the coming decades. Anderson was told by the billionaire that he will be dead before his dream can become reality.

In 2020, Musk said he would send 1 million people to Mars by the year 2050. The first human on Mars might land in 2029.

Anderson was told by the CEO of the space company that he expects the company to have its first orbital launch within a few months.

Success is not guaranteed, but excitement is.