Earlier this year, NASA updated its iconic “Blue Marble” image of the Earth, and last week, it released the first version of the “Black Marble,” its image of the planet at night.

To commemorate this, the mission team assembled this into a map and projected it over the globe: NPP's "Blue Marble," western hemisphere, data acquired from about 824km altitude It's a synthetic ...

Here’s how it works. Why it's incredible: The marble walls reflect the turquoise color of the water in the cave, tinting them blue. The Marble Caves are natural rock formations with curved walls ...

The "Blue Marble" was the first photograph of the whole ... teetering on the edge of perilous drops. The Tam Nam Lod Cave is home to over a quarter of a million swifts. But there are hidden ...

The Marble Caves of Cuevas de ... the water levels rise and create a deep, cerulean blue. They're accessible only by boat. Tours range from $15-$75. The caves look innocuous from the outside.