lunamoonfang
Posts : 241 Join date : 2010-10-27
| Subject: Rychnov nad Kněžnou Tue Dec 14, 2010 8:20 pm | |
| Rychnov nad Kněžnou (Czech pronunciation: [ˈrɪxnof ˈnat kɲɛʒnou̯]; German: Reichenau an der Knieschna) is a town in the Hradec Králové Region of the Czech Republic. It has around 12,000 inhabitants. This is a small town, with a sprinkling of other small towns in the vicinity. The nearest big city (more than 100,000 inhabitants) is Hradec Králové which is about 32 km to the west. Madeleine Albright (former US Foreign Secretary) hailed from this part of the world. ____________ safari dealstuscany villas for rent | |
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lunamoonfang
Posts : 241 Join date : 2010-10-27
| Subject: Re: Rychnov nad Kněžnou Wed Dec 15, 2010 9:08 pm | |
| Atmosphere of the Moon The Moon has an atmosphere so tenuous as to be nearly vacuum, with a total mass of less than 10 metric tons.[71] The surface pressure of this small mass is around 3 × 10−15 atm (0.3 nPa); it varies with the lunar day. Its sources include outgassing and sputtering, the release of atoms from the bombardment of lunar soil by solar wind ions.[5][72] Elements that have been detected include sodium and potassium, produced by sputtering, which are also found in the atmospheres of Mercury and Io; helium-4 from the solar wind; and argon-40, radon-222, and polonium-210, outgassed after their creation by radioactive decay within the crust and mantle.[73][74] The absence of such neutral species (atoms or molecules) as oxygen, nitrogen, carbon, hydrogen and magnesium, which are present in the regolith, is not understood.[73] Water vapour has been detected by Chandrayaan-1 and found to vary with latitude, with a maximum at ~60–70 degrees; it is possibly generated from the sublimation of water ice in the regolith.[75] These gases can either return into the regolith due to the Moon's gravity, or be lost to space: either through solar radiation pressure, or if they are ionised, by being swept away by the solar wind's magnetic field.[73] ____________ Touch Free DispensersyntheticgrassGeelong | |
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