The ozone concentrations shown are very small, typically only a few molecules O3 per million molecules of air. But these ozone molecules are vitally important to life because they absorb the biologically harmful ultraviolet radiation from the Sun. There are three different types of ultraviolet (UV) radiation, based on the wavelength of the radiation. These are referred to as UV-a, UV-b, and UV-c. The figure also shows how far into the atmosphere each of these three types of UV radiation penetrates. We see that UV-c (red) is entirely screened out by ozone around 35 km altitude. On the other hand, we see that most UV-a (blue) reaches the surface, but it is not as genetically damaging, so we don't worry about it too much. It is the UV-b (green) radiation that can cause sunburn and that can also cause genetic damage, resulting in things like skin cancer, if exposure to it is prolonged. Ozone screens out most UV-b, but some reaches the surface. Were the ozone layer to decrease, more UV-b radiation would reach the surface, causing increased genetic damage to living things.
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Penggunaan logo, lencana, dan lambang NASA dibatasi per undang-undang AS 14 CFR 1221.
Situs NASA merupakan rumah untuk sejumlah besar gambar dari badan antariksa Soviet/Rusia, dan lembaga ruang angkasa non-Amerika lainnya. Ini belum tentu berada dalam domain publik.
Proyek gabungan SOHO (ESA & NASA) menyiratkan bahwa semua bahan yang dibuat oleh probe-nya adalah berhak cipta dan memerlukan izin untuk penggunaan komersial non-pendidikan. [3]
Levels of ozone at various altitudes, and related blocking of several types of ultraviolet radiation. The ozone concentrations shown are very small, typically only a few molecules O<sub>3</sub> per million molecules of air. But these ozone molecu
La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Levels of ozone at various altitudes, and related blocking of several types of ultraviolet radiation. The ozone concentrations shown are very small, typically only a few molec
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