Simple lang, Just like what I said sa post ko sa "Do you believe in UFOs" thread, UFOs (Unadentified FLYING objects) are not true.
Parang BIG FOOT sightings lang yan sa USA which is wala naman talagang creature na Big Foot na nag eexist sa Earth.
Primarily, wala silang technology to do it, kung meron man, do you think hahayaan nila na may times na makita natin sila lumilipad lipad? If they can travel galaxies to galaxies, planets to planets, mag labas pasok sa atmosphere natin ng hindi na susunog or hindi lumalapag, do you think as simple as using a stealth technology para hindi natin sila makita eh hindi nila maafford or magawa?
Bakit nagkakaron ng UFO sightings? kasi poor sila sa technology? If you will go to an unknown planet na may life form, at pag aaralan ng patago yung planetang ito, sa tingin mo ba hindi "Stealth technology" muna ang dapat mong unahin?
So just to be clear, I dont believe in UFOs but I believe in other life forms outside our Galaxy or planet. Who knows meron palang life forms within our Milky way such as sa Mars, or Jupiter.
So technically, why they have not contacted us? First, they don't have the technology to do it. Second, They don't even know that we exist. Third, they are hundreds or thousands of light years away. I dont believe that there are supreme beings, more advanced technology etc. Kasi if there is, other life forms would share us knowledge para makasurvive sa galaxy na to.
And the fact that they don't know that we also exist, ibabalik ko ang tanong sa mga "Aliens". So ang tanong is
"If aliens are out there...why haven't they contacted us?"
Hindi to facts. It's basically just the most practical and the most nearest explanation in reality para sakin based on science.