Today, the air we breathe has lots of oxygen – over 20 percent! But that wasn’t always the case.
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Ode to Oxygen
Today, the air we breathe has lots of oxygen – over 20 percent! But that wasn’t always the case.
Ask An Earth and Space Scientist
Ask An Earth and Space Scientist is an educational resource for students, teachers, parents, and life-long learners. We encourage anyone interested in earth and space to make use of its content.
Space exploration is an adventure unlike anything else. Discover the history and future of humans in space to learn how you could be a part of it.
If humans discovered aliens, what would they look like? And where would we find them?
When people think of objects in the solar system, they might think about planets first. But there are so many other objects in space to explore.
