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“Our sun”. Winner: Mercury Rising by Alexandra Hart (UK) On 9 May 2016, the Transit of Mercury occurred, with the smallest planet in the solar system passing directly between the Earth and the sun over the course 7.5 hours – the longest transit of the century. Mercury can be seen towards the centre of our star in the image as a tiny black dot. Preston, Lancashire, UK, 9 May 2016 TEC140 140 mm f/7 refractor telescope at f/9.8, Solarscope DSF100 H-alpha filter, Sky-Watcher EQ6 Pro mount, PGR Grasshopper 3 camera, stacked from multiple exposures. (Photo by Alexandra Hart/Insight Astronomy Photographer of the Year 2017)
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