I&#x27;ve been a long time skeptic of SpaceX&#x27;s goal, and I have to admit that I&#x27;m reconsidering my assessment with that successful landing.  Frankly I&#x27;m amazed they eventually managed to do that.<p>But let&#x27;s not get too carried away, ok?   Because with sentences like:<p>&gt; Mars, asteroids, the Oort cloud and beyond, all with technology and physics we thoroughly know today.<p>and:<p>&gt; The SpaceX future is completely open, currently only limited by the amount of atoms in the universe.<p>it really seems like this is way too optimistic.  I mean it&#x27;s not like SpaceX has cracked interstellar travel or anything.  Mentioning the Oort cloud for instance is quite weird : we barely can send un-manned spacecrafts there.  And even if we could, it&#x27;s such a big place that bodies there are separated by astronomical units of emptiness.  What exactly would men do there?<p>Also, even if we can bring the cost of space-flight to something comparable to the cost of an intercontinental airplane trip, I would remain skeptical about mars colonization.  The fact remains that mars is a gigantic barren waste land, with a tenuous, oxygen-less atmosphere, barely any water, frigid temperatures and continuous radiations from the sky.<p>Imagine the worst place on Earth where to spend your holidays.  If a travel agency tells me that prices for a plane ticket to this place have dropped by 99%, I&#x27;d still would not want to go there.  I wouldn&#x27;t even go for free.