Galaxies & the Universe
📋 What it is
A galaxy is a gravity-bound collection of billions of stars; the universe holds billions of galaxies.
🗣️ Coach says
Stars gather into galaxies — vast spirals or blobs of billions of stars bound by gravity, often around a central giant black hole. Our Milky Way is one galaxy among hundreds of billions in the observable universe.
🧠 Memory hook
Stars → galaxies → universe. We live in one galaxy: the Milky Way.
😂 Giggle
What did the Moon say to Earth?
"I'm always revolving around you — you really have a pull on me!"
😲 Whoa!
There are more stars in the observable universe than grains of sand on all of Earth’s beaches combined.
✅ Quick check: What galaxy do we live in, and what is a galaxy?
Say your answer out loud first — then reveal.
The Milky Way — a gravity-bound collection of billions of stars, gas and dust.
Galaxies are the large "cities" of stars; ours is the Milky Way.
🧪 Try it! (2 minutes)
Sprinkle salt in a loose spiral on dark paper — a mini galaxy; each grain = billions of stars.