Question: It is true that there will be asteroids artificially set in Moon’s orbit? In how many years can it be possible? It will be temporary? They will be seen from Earth? Thank you for your answers. — Claudio
Answer: NASA has proposed a project to pull an asteroid into the Moon’s orbit in order to test technologies for redirecting those asteroids that might collide with Earth. Note, though, that this is still just a study, with few firm details for actually placing an asteroid into the Moon’s orbit.