Twinkle twinkle little... Earth? Yep, our planet does indeed sparkle from space—just like stars. But why? This question has perplexed many scientists for years, including famed astronomer Carl Sagan. That is, until now. In a May 2017 study, a team of NASA researchers explained the source of Earth's shimmer: horizontal ice.
All That Glimmers Is Ice
Planets That Sparkle
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Key Facts In This Video
If the Earth was a flat disk, approaching the edge would feel like climbing a hill that becomes gradually steeper. 00:44
Modern "Flat-Earthers" believe that the Earth is flat, and that photographs taken from space are all elaborate hoaxes. 05:04
To a cosmic ray proton traveling at nearly the speed of light, Earth appears to be a mere 56 feet (17 meters) thick. 07:50
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