Kind of supernovae

FOUND ONLINE: In 2011 a team of astronomers used just this kind of supernovae to measure luminosity independently of distance -- and in the process, discover the existence of dark energy.

I wonder why they used supernovae, the plural form of supernova. I see no reason to do so. I think supernova would have worked fine here.

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MORE EDITOR@WORK BLOG ENTRIES

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• Reminders for would-be novelists

• What I do when I'm editing

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BLOG ENTRIES BY TOM GILLISPIE

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• Links to TG's stories online

• Favorite quotes

• What I do when I'm editing

ANECDOTES BY TOM GILLISPIE

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BLOG ENTRIES FROM THE AUTO RACING JOURNAL

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(a book of great stories about the Intimidator)

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