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| Author : | Topic: Cosmology | Bottom |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! ![]() |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! ![]() |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! ![]() |
- Very High Energy gamma-rays do not occur naturally on Earth. They are associated with the acceleration and interaction of relativistic particles at energies beyond those achievable in man-made accelerators. Gamma-ray astronomy is the astronomy of the "non-thermal universe", tracing the most violent and energetic phenomena at work inside our galaxy and beyond. These phenomena include the explosive deaths of stars (supernovae or hypernovae), the particle winds and shocks driven by neutron stars spinning on their axes millions of times faster than the sun, and the superluminal jets of active galaxies powered by super-massive black holes. Unlike charged cosmic ray particles, gamma-ray photons wing their way directly to us without having their paths bent by galactic and extra-galactic magnetic fields. They are also more penetrating than light of longer wavelengths, so less easily absorbed by the gas and dust surrounding feeding black holes. VHE gamma-rays therefore offer a unique insight into some of the most extreme regions of our universe. The only trouble is, there are very few of these exceptionally energetic photons, so satellite detectors simply aren't big enough to catch them. We need instruments which can collect gamma-rays from an area the size of a couple of football pitches... - |
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