Astronomy Picture of Day: Hurricane and M51# Astronomy - 天文
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Logarithmic Spirals Isabel and M51
Credit: Comparison and M51 image copyright Brian Lula; Hurricane Isabel, courtesy GHCC, NASA
Explanation: Uncomfortably close hurricane Isabel (left) and 30 million light-year distant galaxy M51 actually
don't have much in common. For starters, Isabel was hundreds of miles across, while M51 (the Whirlpool
Galaxy) spans about 50,000 light-years making them vastly dissimilar in scale, not to mention the extremely
different physical interactions which control
Credit: Comparison and M51 image copyright Brian Lula; Hurricane Isabel, courtesy GHCC, NASA
Explanation: Uncomfortably close hurricane Isabel (left) and 30 million light-year distant galaxy M51 actually
don't have much in common. For starters, Isabel was hundreds of miles across, while M51 (the Whirlpool
Galaxy) spans about 50,000 light-years making them vastly dissimilar in scale, not to mention the extremely
different physical interactions which control