Agalaxy is a system of celestial bodies, such as stars, planets, several solar systems, and interstellar gas and dust. our solar system is a part of a galaxy called . nextreset

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

you should wear a lead protective shield when having teeth x-rays

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-lavira : )