Surprisingly, over the course of most of humanity's existence, we had no idea that other galaxies even existed. All we could see was our own little corner of the universe. It wasn't until the early 1900's that the nature of the so-called "Andromeda nebula" was discerned. Edwin Hubble settled the galaxy vs. nebula debate in 1925, […]

Deep dark space contains spectacles all over the place! Types of Nebulae, NASA content. aRtVerse Infographic I have always loved space and the awe inspiring photos of far away galaxies and magical …

NASA's Jet Propulsion Laboratory, the leading center for robotic exploration of the solar system.

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So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but how many galaxies are in the universe?

Ready for liftoff? Take to the starry skies with this worksheet that explores the three basic types of galaxies.

The evolution of stars in our Universe. Full size (and printable) version of this and other Astronomy Infographics.

Galaxies are another fantastic follow up to the first great lesson. Since galaxies are incredibly beautiful, I wasn't satisfied with p...