Don't tell me the sky is the limit when there are footprints on the moon.

When people say the quote, "The sky is the limit", there are actually two very different perspectives of looking at it. For many (or most I should say), it's obviously a motivational and inspirational boost, and rightly so. The sky is actually very, very, VERY high. Getting far up enough and reaching the point of completely escaping the atmosphere and gravitational pull of Earth was an impossible feat by all of mankind until about 60 or so years ago. In fact, the Great Pyramid was the tallest structure on Earth for over 4,000 years, and it was only 146 meters tall. But for a very small few, that saying doesn't go far enough. Their goals and aspirations are much greater, and now even Earth is too small for them, quite literally! You know exactly who I'm talking about! (*cough* Bezos, Musk, Branson *cough*) The footprints made on the moon, along with the rovers recently sent to Mars, confirm that the sky is definitely not the limit! What's your take?