There are many precious minerals in space, but does anyone own it? Is harvesting these resources stealing?
Some people may believe that this is theft as there is no way to legally buy space materials and to illegally gain these materials would quite indefinitely result in backlash from other countries. So, since there is no way to use these materials, what do we do? With a large number of resources at our disposal, a lot of aspects of common life would be greatly improved. But since there is no 'legal' way to benefit from these materials, we kind of have to 'steal them.
Other people might disagree and think that it isn't theft as no one owns them and the definition of stealing is as follows,
gerund or present participle: stealing
take (another person's property) without permission or legal right and without intending to return it.
"thieves stole her bicycle"
But since no one owns these resources it shouldn't be classed as stealing because we have no one to get 'permission from.
Overall there are many ways in which taking these materials could be seen as theft but there are also many ways it isn't classed as stealing.