Page 9 - The Universe and You

Our swirling Milky Way galaxy contains hundreds of Scientists learn a lot about stars by observing their
billions of stars, all rotating around the center of the color. For example, the blue lights indicate the hottest
galaxy. Source: Credit: NASA/JPL-Caltech (Artist Concept) and youngest stars in this cluster. Credit: ESA/Hubble &
NASA, P. Dobbie et al

Our solar system is part of the Milky Way galaxy, which holds more than 100 billion stars. It’s
hard to imagine something that huge.

But our universe is much bigger! It’s so massive, scientists aren’t sure how many galaxies it

contains, but they think it’s at least hundreds of billions. Our vast universe includes everything!
All people, animals, and plants. All planets, stars, and galaxies. The universe even contains

space, light, and time. It’s the largest thing that exists. And scientists say the universe is still

expanding and growing bigger all the time!