Season 14 Episodes13
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When Mercury Crosses the Sun
Apr 28, 1970
On 9 May the tiny planet Mercury will be seen as a black dot in transit across the sun's disc. Because it orbits close to the sun, Mercury has always been difficult to observe, and astronomers can only guess at the nature of this
Seasons70
Episode Summary
"When Mercury Crosses the Sun" is episode 5 of The Sky at Night season 14. It aired on April 28, 1970.