You, me and everyone else might be able to think and say one simple word, 'alien'. Just curious, when that word crossed in our minds and said, we are all refer to the same object.

The 'element of surprise' of the alien invasion will cause a certain event in human side which is called the 'moment of shocking'. This will be an advantage point to the invaders, a weakness point in human side. This kind of situation, can only be overcome if and only if, some protocols of counter-invasion have been made before.

For the sake of popularity, vote, and reelection, most governments remain secretive to the public about the truth of alien contact with mankind. For them, it is better like that than being thrown from the throne.

The truth is sealed. Life goes on. Till one day, history changed... Like thief in the night, alien invade human. Chaos happens prior to the new order of coexistence. The truth is sealed. Life goes on. Till one day, history changed...

If you hear news about UFOs and aliens in normal daily life, do not just easily believe in it. But if you hear news about series of natural disasters and serious incidents in the sky, then try not to be terribly shocked when their presences can be detected by human eyes.

Regarding alien beings and UFO sightings,
They're less about 'where' or 'when' to find,
more about 'how' or using 'what' to identify.