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Lagrange Points - Sixty Symbols
RFlaggI thought they covered 2010 TK7 and Cruithne (not a trojan but promoted as Earth's second moon for a while) before, at least in their Deep Sky video series, but I'm not seeing it... And not under tdarnell's videos either...
Meanwhile, I didn't think this would get in the top 15 let alone the top 5... I figured it would Sift though...
In 2010, we discovered our first (and only) trojan asteroid for sun-earth at L4. I'm surprised the video didn't mention it.
http://en.wikipedia.org/wiki/Earth_trojan_asteroid