How Do Astronauts Sleep When There Is No Up or Down in Space?
Imagine going to bed without a mattress, pillow, floor, or even a reliable sense of which way is …
Where Did Earth’s Water Come From? The Evidence Points to More Than One Source
Look at Earth from space and the question seems almost unavoidable: how did a rocky planet that f…
Why Does Mars Have the Largest Volcano in the Solar System?
Mars is only about half Earth’s diameter, yet it carries a volcano so enormous that nothing else …
Could We Mine Gold From an Asteroid and Bring It Back to Earth?
Imagine finding an asteroid with enough gold to make every terrestrial mine look tiny. Could a sp…
What Is the James Webb Space Telescope Actually Doing in Space?
The James Webb Space Telescope is not simply floating in space taking beautiful pictures whenever…
Why Have We Never Seen the Solar System From Above?
Most diagrams make the Solar System look like a neat target: the Sun in the middle, eight planets…
Is Earth a First-Generation Planet — or Did Many Worlds Come Before Us?
Earth feels ancient because it is about 4.6 billion years old, but on the universe’s clock it is …
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