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Echo - Wikipedia, the free encyclopedia (331 words) |
 | Light echo, a visual phenomenon seen when light from a rapidly brightening object such as a nova is reflected from interstellar matter. |
| Echo I or Echo II, classes of Soviet submarines. |
| The Echo (Irish Newspaper) a regional newspaper in Dublin, Ireland. |
| Echo (683 words) |
| Following the failure of the launch vehicle carrying Echo 1, Echo 1A (commonly referred to as Echo 1) was successfully orbited, and was used to redirect transcontinental and intercontinental telephone, radio, and television signals. |
| Echo 2 continued the passive communications experiments, and also investigated the dynamics of large spacecraft and was used for global geometric geodesy. |
| Echo 1's surface was used to reflect 960 and 2390 Mhz signals. |
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