Facts about the Milky Way We kick off our guide with some cool Milky Way facts before diving deeper into our cosmic neighborhood. The Milky Way Type: Barred Spiral GalaxySize: About 150,000 light-years acrossMass: 1.5 trillion solar massesConstellation: SagittariusNumber of Stars: About 100 to 400 billion The Milky Way is our home galaxy. The Sun … Continue reading Milky Way