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Tesla and SpaceX CEO Elon Musk participated in a Reddit Ask Me Anything session this week, during which he fielded 15 questions about the SpaceX Interplanetary Transportation System (ITS).

Musk said his SpaceX team plans to test a booster fuel tank "in the coming weeks" to see how it fares when two-thirds of its power is put to the test. He added that the ITS moniker isn't working, and his team is now looking for a new one that better suits an effort to bring humans to Mars.

Musk has been one of the more outspoken proponents of going to Mars and has said on numerous occasions that he believes it can be achieved by a private company like SpaceX and not just a government agency.

Musk, who also serves as CEO of electric car maker Tesla, outlined his plans in far more detail than ever before last month at the International Aeronautical Congress in Guadalajara, Mexico. He said at the event that he wants to send 1 million people to Mars, where they'll establish a permanent residence and make humans a "multiplanetary species" that can live on Earth and Mars.

If everything goes smoothly, it would take around "40 to 100 years" to achieve a fully self-sustaining civilization on the Red Planet, he says.

During the AMA, Musk also said that reusable rockets and boosters will be critical for trips to Mars, which could eventually cost less than $100,000 by employing reusable equipment.

Looking ahead, Musk said humans will likely live in glass domes on Mars and much of their work will go on in pressurized caves that are dug on mining droids. In other words, Mars is going to be a much different-looking place. And that's why Musk—and his fans—are so excited about it.