There are a lot of theories out forward by scientists on whether alien technology exists or not. And constant researches have been going on on this subject. Recently, there was a comprehensive search performed on a patch of southern sky and no evidence or hint were found out at low radio frequencies.
As we know, the Vela region is populated by a wide range of 10 million stars and thus, this was the toughest, widest and deepest survey of extraterrestrial intelligence till now. The Murchison Widefield Array (MWA) in Australia in its research got to observe no technosignatures in the whole range.
On the other hand, Chenoa Tremblay and Steven Tingay, astronauts from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR) said that they aren’t disappointed by the results. Rather, according to what they think, the result shows the easiness of the procedure of conducting the search for extraterrestrial intelligence (SETI). And their positivity is really appreciated by everyone else.
SETI can be done easily while doing researches about other astrophysical observations too. However, it is surely a bit tricky. Because we do not have an idea about the technologies being developed by the aliens thus, based on the technologies and theories developed by us, we try to figure out things about them.
According to the scientists, if aliens produce some sort of signals and if they are sufficient enough to get detected, the scientists will be able to identify them. Researches about alien technologies will continue happening and we hope to get more information about it in future. But we also know that universe has a lot of mysterious things which are still unsolved and we have to go a long way until we find out everything.