![](http://gnitergroup.com/wp-content/uploads/2022/05/FB_IMG_1651906410805-772x1024.jpg)
Mercury’s surface contains small amounts of sodium. The reason for this yellow tail is that it shines in the sunlight .
![](http://gnitergroup.com/wp-content/uploads/2022/05/messenger-16-na_exosphere_2015-1024x774.png)
When exposed to sunlight, not only are the sodium atoms released, but other elements also come out of the surface in this way.
![](http://gnitergroup.com/wp-content/uploads/2022/05/sodiumtail_strip2.gif)
Mercury’s tail was first discovered in 2001. Then, from 2011 to 2015, Messenger orbited Mercury, giving it much clearer information.
![](http://gnitergroup.com/wp-content/uploads/2022/05/Mercury_Sodium_tail_PIA11076.jpg)
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