Human Vs Alien

Existing reports said that we are super being, But recently another being is appeared, They are called Alien who are different thing Do they really exist? If they are exist,  then how do they look like? Are they more intelligent than us? Do they know how to airstrike? Are they dangerous or generous? Where do they live? What type of foods are taken by them? How do they survive? Do they have any ecosystem? Still there is no reliable evidence of Alien, Who can dominate on us, There is no chance because we are antialien; Even our brains thinking power is enormous.