Galaxies for Kids: The Milky Way and Light Years Explained (Grade 6 and Grade 7 Science)

Hi, I'm Luna from DoodleBeez. On a dark night, far from city lights, you might see a faint, milky band across the sky. That glowing band is part of our home galaxy. Today we are exploring galaxies!

A galaxy is a huge group of stars, gas and dust, all held together by gravity. Our galaxy, the Milky Way, has hundreds of billions of stars. Our Sun is just one of them!

Space is so big that kilometers are too small to measure it. Scientists use light years. A light year is how far light travels in one year, which is about nine and a half trillion kilometers!

The Milky Way is a spiral galaxy, shaped like a pinwheel. It is about one hundred thousand light years across, with a giant black hole at its center. Our Sun sits in a spiral arm, about halfway out.

Galaxies come in three main shapes. Spiral galaxies have curving arms. Elliptical galaxies are smooth ovals or balls of older stars. Irregular galaxies have no clear shape, often because gravity from another galaxy pulled them out of shape.

The universe holds billions of galaxies. Our nearest big neighbor is the Andromeda Galaxy, about two and a half million light years away. The light we see from it today left Andromeda before modern humans existed!

Now it's your turn. A galaxy looks like a smooth, round oval with no arms. Which shape is it, spiral, elliptical or irregular? Pause and try. It is an elliptical galaxy, a smooth oval of stars.

Great job! Remember, a galaxy is a huge group of stars held together by gravity. We live in the Milky Way, a spiral galaxy, and we measure space in light years. Practice galaxies in the Science Lab at doodlebeez.com. See you next time!