Given a law of gravity and an assumption about how the matter is distributed, the next step is to work out the dynamics of the universe - how space and the matter in it evolves with time.
NASA’s latest space telescope, the Solar Dynamics Observatory, is delivering unprecedented images of our local star.
美国航空航天局最近发射的空间望远镜——太阳动态观测台，首次给我们展现了太阳的图像和视频。
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The agency will venture further out into space with newmissions, including the Solar Dynamics Observatory, launching in February tobetter understand the sun's influence on Earth.