Our galaxy - the Milky Way - is a spiral galaxy with arms extending from the
center like a pinwheel. Our solar system is in the Orion arm of the Milky Way.
Our Sun is one of about 100 billion stars in the Milky Way. And our galaxy is
just one of roughly 100 billion in the visible universe.
1More
Free Technology for Teachers: Economics Lessons Using Planet Money Podcasts - 59 views
USGS Astrogeology: Map-a-Planet - 26 views
1More