探索我们不断变化的地球
50 多年来， 卫星提供了有关地球陆地、水、空气、温度和气候的数据。美国宇航局的地球信息中心让游客可以看到我们的星球在六个关键领域的变化：海平面上升和沿海影响、健康和空气质量、野火、温室气体、可持续能源和农业。
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Read More我们的太阳系包括太阳、八颗行星、五颗正式命名的矮行星、数百颗卫星以及数千颗小行星和彗星。
我们的太阳系位于银河系，这是一个由两个大旋臂和两个小旋臂组成的棒状螺旋星系。我们的太阳位于银河系的一个小的、部分的臂中，称为猎户座臂或猎户座支线，位于人马座臂和英仙座臂之间。我们的太阳系以大约 515,000 英里/小时（828,000 公里/小时）的速度围绕银河系中心运行。绕银河系中心绕一圈大约需要 2.3 亿年。
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