Observable universe

The observable universe is like a giant, invisible bubble around our Earth. Everything inside this bubble is stuff we can see or has sent us messages, like light, since the universe began. It’s like a giant cosmic neighborhood where we can see all our neighbors! This bubble is the same size in every direction, so no matter where you look, you see about the same amount of space.

This bubble is HUGE! It’s so big that it would take light, the fastest thing ever, about 46.5 billion years to travel from the edge to us. That's way, way longer than you've been alive or even longer than dinosaurs lived! It’s like trying to count all the grains of sand on all the beaches in the world, and then some!

Inside our observable universe are all the stars, planets, and galaxies that we can possibly see. This includes our own Sun and all the other stars in our Milky Way galaxy. It also includes billions of other galaxies, each with billions of stars! It's like a giant city filled with countless twinkling lights.

Nope! Because light takes time to travel, there are parts of the universe that are so far away, their light hasn't reached us yet. It’s like trying to hear a whisper from across a huge playground. So, the observable universe is just the part we can currently see, not the whole entire universe!