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Physics & Astronomy Facts

A speck from a comet? Displayed in a close-up under an electron microscope, this tiny bit ofcosmic dust may be our first sample of a passing comet. Less than one-tenth of a millimeter across, the particle is composed of millions ofeven tinier crystals.
It's Dusty Out There

There is no lower limit to the size of the solid particles that move around the Sun. Small asteroids grade downward into large meteoroids and then into smaller pebbles and so on down to the tiniest pa ...
Beta Decay
Neutrinos to the Rescue

Have you ever wondered what the most abundant particle in the universe is after photons of light? The answer is: Neutrinos. These tiny, neutral and almost mass-less particles that move at almost the ...

A Giant X-Ray Machine

The first clear detection of X-rays from the giant, gaseous planet Saturn has been made with NASA's Chandra X-ray Observatory. Chandra's image shows that the X-rays are concentrated near Saturn's equa ...

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