Where to go after the Moon? The answer is Mars. NASA Administrator announced that before President Trump’s term ends, they will lay an "intercontinental railway" to Mars. It sounds like science fiction, but this is NASA’s real plan. How to achieve it? Rely on nuclear power. Specifically, nuclear propulsion technology. What’s the use of this? It can efficiently transport large amounts of supplies to Mars, just like how railroads once transported people and goods to the West. Sending astronauts to Mars is technically close. The real challenge is how to bring them back safely. That’s where nuclear power comes in. Nuclear-powered rockets will be key to establishing a Mars outpost and mining resources on Mars. More importantly, they can produce the fuel needed to return to Earth. Trump’s space policy is not just about returning to the Moon. His goal is to establish the United States’ absolute dominance in deep space. In this new frontier of space exploration, giving up the lead means giving up the future. While some are still debating identity politics and climate issues on Earth, the new arena of great power competition has already extended into outer space. This is the ultimate test of a nation’s industrial strength, technological level, and long-term strategic vision. If a country loses the courage to explore the stars and the oceans, it’s not far from decline. Is this Mars plan a visionary, grand strategy, or a costly new chapter in the space race? History will tell.