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"A dwarf planet", not "An". Also, too many commas and no need to capitalize every word.

Grammar, FTW.

Re: the commas, see the Free Modifier example from https://en.wikipedia.org/wiki/Comma#Parenthetical_phrases

The commas are not ideal, but neither are they ungrammatical.

Capitalising all words in a headline is an acceptable grammatical style - you'll find it in US newspapers, for example. It does look a bit weird in some cases, however.

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