by Lizzie Bennett, Underground Medic:
We have all heard of city killer asteroids, we have all seen the disaster movies of the impact, but few of us have any idea just what an asteroid bearing down on us would look like. 3km, 1.86 miles, is generally considered a small distance, but when considering a lump of space rock that size hitting a major metropolitan area…it’s massive.
Our sense of scale tends to adjust to circumstances. So when we think about comets it is easy to compare them with other astronomical objects. In which case comet 67P/Churyumov-Gerasimenko, just 3km wide, sounds tiny.
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