[YoshiDino2014]

The Fermi Paradox:

If the world had been around for millions, billions and trillions of years...
WHERE ARE ALL THE ALIENS?

well there are several ideas and suggestions about this paradox, we havent figured it out yet

here's a short beginner's guide: *ahem*

the observable universe is about 90000000 lightyears apart, with around 100,000,000,000 galaxies each with 100,000,000,000 to 1,000,000,000,000 stars, and these stars have earth-like planets, we'll refer to this as 'habitable planets'

but for now lets talk about the milky way, which consists of up to 400,000,000,000 stars with about 20,000,000,000 sun-like stars in the milky way, and estimates suggest 1/5th of them have a habitable planet orbiting it.
if only 0.1% of those planets had life, then there would be 1,000,000 planets with life in the milky way

here's the thing: over the past 13 billion years the milky way "exploded" alot,

anyways lets get on with possible sollutions:

no.1 earth is the first habitable planet, and recently things have cooled down to allow complex life to exist

no.2 earth is NOT the first habitable planet, and complex life needs more thing to happen than we know

but none of these really makes sense since that there had been billions of years of which living things can grow
thats what makes

THE FERMI PARADOX

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More info from Kurzgesagt

THE FERMI PARADOX part 1

THE FERMI PARADOX part 2