| Observations Confirm Theory: Quasars Have Accretion Discs |
 | It was long predicted that quasars may in fact be black holes found in the center of large discs of hot matter. However, it was never really proven through observations that this was in fact true. Confirmation now comes from a team of astronomers from the Max Planck Institute for Radio Astronomy in Bonn who used a light polarization technique to show how the surroundings of a black hole are able to output an amount of light one trillion ti ... [read more >>] |
| 24 July 2008, 02:45GMT | (c) 2008 Softpedia |
| How Night Vision Goggles Work |
 | Night vision devices primarily work either on image enhancement or thermal imaging techniques. Image enhancement night vision goggles rely on gathering small amounts of light given off by the surrounding medium, such as infrared light for example, which is invisible to the human eyes, then amplifying it in the visible light spectrum, so that the image becomes clear. Thermal imaging, works basically on the same principle, although the night ... [read more >>] |
| 21 May 2008, 09:10GMT | (c) 2008 Softpedia |
| How Motion Sensors Work |
 | There are two types of motion sensors currently commercially available, the active sensors and passive sensors. A motion sensor is classified as being active only when it emits some kind of energy into the surrounding medium to make an accurate reading, whether it is infrared light, microwave radiation or sound waves. Passive motion sensors do not emit energy, but can identify possible burglars by reading relative changes in the energy in ... [read more >>] |
| 07 May 2008, 06:04GMT | (c) 2008 Softpedia |
