Uncharted Meteors
In 1967, NASA's Mariner 4 spacecraft was cruising through the solar system, not far from Earth, when something unexpected happened. 'Mariner 4 ran into a cloud of space dust,' says Bill Cooke of the Marshall Space Flight Center Space Environments Team. 'For…
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Medicine
What Is Autism?
Autism is not a disease, but a developmental disorder of brain function. People with classical autism show…
Astronomy
Mission: Gather Comet Dust; Return To Earth
One of the most imaginative NASA missions of recent years is the Stardust mission. Its main purpose: to gather…
Geology
What Is Air Pressure?
You can think of our atmosphere as a large ocean of air surrounding the Earth. The air that composes the…
Astronomy
A Satellite Of Our Own
The regular daily and monthly rhythms of Earth's only natural satellite, the Moon, have guided timekeepers for…