There are countless planets in the universe that can give birth to alien civilizations. Why can't humans find aliens?

"Unnamed" planets of aliens found - Aliens Existence in Universe Discovery Documentary

Cosmos A Spacetime Odyssey HD Hindi Urdu Episode-1 Standing Up In The Milky Way | amazing space documentary about earth, planets, stars, universe, life, scientists, old civilizations, dark space

Top 10 Advanced Ancient Civilizations That Might Have Been Aliens

Ancient Aliens: Evidence Of Lost Civilizations On Mars (Season 14) | History

Did THEY Contribute to the Birth of Human Civilization - Ancient Aliens

Types of civilizations - Most advanced civilizations in the universe

Did Humans Evolve from Apes | How did God Created Man | did humans evolve from apes | apes,planet of the apes,did humans evolve,dawn of the planet of the apes,how did god created man,did humans descend from aliens,human evolution,where did humans evolv

Scientist says Aliens in UFOs might be Earthlings from the Future - Aliens are Humans

The Planets - Se2 - Ep11 - Dwarf Planets-Aliens Among Us HD Watch

UFO DOCUMENTARY 2015 Secret KGB Alien Civilizations Project Alien Documentary HD

Unsealed Alien Files S02E07 Aliens & Civilization

ALIEN CIVILIZATION ATTACK 2014, secret war ufo! aliens destroy nasa weapons II

Insan Aik Alien Hai ? | Facts About Humans | Aliens | tahi tv

My Guardian Alien: The aliens hide from the humans (Weekly Recap HD)

Unsealed: Alien Files – Aliens and Civilization episode 29

Alex's alien theory: Alex Reid thinks humans were created by aliens

Ancient Civilization ON THE MOON-! - The Proof Is Out There - Aliens on Moon - Alien Base on Moon

Scientists Say Other Advanced Civilizations Have Likely Existed In Universe

Exploring the Life and Heroic Deeds of Leonidas | A Deep Dive into History | mysterious universe | ancient greek | ancient civilizations | 300 spartans

Carl Sagan On Alien Civilizations