Musk said that the plan to build a city on Mars may cost up to 10 trillion US dollars. Why does everyone call him a liar?

The cost of sending 12 people to the moon during the Apollo program was 200 billion U.S. dollars in current U.S. dollars, and the average cost per person was 16.7 billion U.S. dollars. Compared with this, the $200,000 that Musk said is too cheap. Why? From some of the details above, you may be able to tell that transportation powered by Space The most critical thing is the recyclability of rockets. Rockets like NASA's are basically used once and then become useless. Although there have been explosions before, SpaceX has successfully recycled its reusable rockets 16 times.

In terms of propulsion, BFR has 31 Raptor engines. Although it is fewer than the 42 initially revealed, this technology can also make it "the most important heavyweight engine in history." The BFR spacecraft is equipped with a "delta wing" that can be used to stabilize the spacecraft, reduce the impact of the atmosphere on Mars and the Earth, and complete takeoff and landing.

Musk said that the Raptor engine has been tested for 1,200 seconds. To demonstrate the progress being made, he also demonstrated a 40-second engine test simulating a Mars landing during his speech. Additionally, another challenge is the huge cryogenic fuel tank. But this is not a problem at all in Musk’s eyes. He said SpaceX has tested a 264,000-gallon prototype 300 feet below the sea. He said, "We now have a good understanding of building a huge carbon fiber tank that can hold cryogenic liquids."

According to Musk, the cost should be controlled at $200,000. In other words, the price of a trip to Mars is equivalent to a house in a second-tier city in China. So, this seems like a big talker.