article_snippet: 1 - A 'giant leap' from moon to Mars .
article_snippet: - Return to moon to Mars .
article_snippet: - Build a lunar base .
article_snippet: - Send humans to the surface of Mars .
article_snippet: - Send humans into lunar orbit .
article_snippet: - Visit an asteroid in its own orbit .
article_snippet: - Return to the surface of Mars .
article_snippet: - Explore Martian moons Deimos and Phobos .
article_snippet: - Enter orbit around Mars .
article_snippet: - Land on the red planet .
article_snippet: - Robotically capture an asteroid .
article_snippet: - Place it in lunar orbit for astronauts to visit .
article_snippet: - Travel to the moons of Mars .
article_snippet: - Place humans in Martian orbit .