Venus? The moon? The various moons in the outer solar system? Agreed that interstellar travel is a ways out if ever... (though it doesn't require physics break

Venus? The moon? The various moons in the outer solar system? Agreed that interstellar travel is a ways out if ever... (though it doesn't require physics breakthroughs, just massive engineering breakthroughs. There's enough hydrogen in the solar system to make fusion powered thrusters theoretically possible).