President Trump vowed Monday to be the first commander-in-chief to put US astronauts on Mars. “The United States will once again consider itself a growing nation, one that increases our wealth, expands our territory, builds our cities, raises our expectations and carries our flag into new and beautiful horizons,” Trump declared in his inaugural address in DC. “And we will pursue our manifest destiny into the stars, launching American astronauts to plant the Stars and Stripes on the planet Mars,” he said.