Attention Educator Member Teachers! Go to our special offers page for information about attractive upcoming professional development events next year. Not an Educator Member? Join Today! Check out resources from our Affiliates!
Global locations of visitors using this page right now
Welcome to Windows to the Universe - your portal to discovery! Explore the wealth of information available here to learn about the Earth and Space sciences and related topics in the humanities including mythology, art, poetry, and more.
Our mobile website version is available now on your phone's web browser and give us feedback.
NEW Subscription Opportunities for Educators and their Students! - Classroom, School, and District Subscription Options.
Windows to the Universe Professional Development - On-site, in your school - find out more about this opportunity here. Information about our upcoming workshops and events is available on our Teacher Resources/Workshops page.
The Cambrian period, at the beginning of the Paleozoic, was the first time that multicellular life forms flourished on Earth. By the end of the Paleozoic, and beginning of the Mesozoic, all the continents ...Read more
Venus is the hottest planet in our Solar System, with temperatures over 460° C (860° F) at its surface. Venus is the 2nd closest planet to the Sun. It is the planet most like Earth in terms of size ...Read more