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The expanding shell of gas shown here, called Abell 33, glows blue. It’s the remnant of a dying star. The bright star that appears to sit on the ring’s edge actually is nowhere near that shell of gas. 

The tuatara is the only surviving member of its order of reptiles. Global warming threatens the long-term survival of this New Zealand native. Shown here is a male tuatara with its crest erect — a typical display of aggression.

Microbes from the digestive tract of Eastern gray kangaroos (like the one shown here with her joey) appear to explain the climate-friendly flatulence of these animals. 

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