maybe- it is still, "technology" only- in ways we aren't accustomed to- as you say- being able to travel by thought. maybe the merkaba is a form of, "spiritual technology"- is there not a science to reiki?
if i had to imagine why there is a need to come to earth- maybe... to assist us in the transition from a lower density to a higher one- is that not what we are experiencing?
maybe- this is a form of service, assisting us during these momentous times
...of course

now is all that really matters... or so i'm learning
I'm not talking about aliens reincarnating on Earth. As that is very possible. I'm talking about an Alein visiting earth. With their bodies/spirit being a higher vibration being on earth would be probably to much to handle.
They do say Aliens reincarnate on earth. Yet, it's a strong price to pay when they come here. For starts they would forget about their heritages for the most part. They would also have to step down from their density and vibrations to be on earth. They also take the chance of getting sucked into earth life/death cycles.
Is there a science to Reiki. It's funny that you mention Reiki in this thread. As Doreen Virtue claims that Reiki is given to us from the Sirians, I think it was trhe Sirians. I don't think science, at this time, will agree on Reiki. I know they will also not agree on the benefits of crystals being anything but a shiney stone.