Discover the exciting possibilities of alien life in our universe!
Welcome, space explorer! đ¨âđđŠâđ Are we alone in the universe? Scientists think there might be millions of planets with life! Let's explore the evidence...
â ī¸ Remember: No aliens have visited Earth (that we know of!), but the universe is BIG and full of possibilities!
A math formula that estimates how many alien civilizations might exist in our galaxy!
It considers: stars with planets, planets that could support life, and the chance of intelligent life developing.
Scientists think there could be between 1,000 and 100 million civilizations in our Milky Way!
Not too hot, not too cold - planets in the "just right" zone around their star might have liquid water!
NASA has found over 5,000 exoplanets, and about 50 are in their star's habitable zone.
đ Earth is in our Sun's Goldilocks zone - that's why we have oceans!
They might not look like green men with big eyes! Life could be:
âĸ Microscopic bacteria đĻ
âĸ Ocean creatures like jellyfish đĒŧ
âĸ Or something completely different we can't imagine!
On other planets, evolution would create different shapes.
SETI (Search for Extraterrestrial Intelligence) uses giant radio telescopes to listen for alien signals.
đ In 1977, they heard the "Wow! signal" - a strong radio burst that lasted 72 seconds. We still don't know what caused it!
No confirmed alien signals yet, but they keep listening...
On Earth, life exists in boiling hot springs, deep ocean vents, and even radioactive waste!
If life can survive here in extreme places, maybe it can survive on harsh planets too!
Scientists study these "extremophiles" to guess where aliens might live.
1. Radio signals - Like cosmic text messages across space
2. Space probes - Like Voyager's golden record with sounds of Earth
3. Direct contact - But space is HUGE, this would take thousands of years!
The closest star is 4 light-years away - that's 40 trillion kilometers!