Are aliens planning to invade? What do they want?

There might just be aliens for real, at least the Russian astronomer Andrei Finkelstein believes in it! He did predict that we will encounter them in 20 years... My opinion is, the technology is expanding exponentially, who knows what kind of crazy things will happen in 20 years? We might just encounter aliens... but I would say it will take us more than just another 20 years...