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According to an analysis of images provided by NASA's Mercury-orbiting MESSENGER, a period of heavy volcanic activity gave Mercury a makeover about 4 billion years ago, erasing the first 400 to 500 million years of its history.
NASA's MESSENGER probe has sent back an image from Mercury that is either an alien's sense of humor, or a few asteroid's depiction of Mickey Mouse on the sun-baked planet.
NASA released the first batch of hundreds of photos taken by MESSENGER during its orbit of Mercury on Wednesday.
Earthâ€™s next-door neighbor, the Moon, has been found by astronomers to be shrinking.
GREENBELT, Md., Aug. 19 /PRNewswire-USNewswire/ -- Newly discovered cliffs in the lunar crust indicate the moon shrank globally in the geologically recent past and might still be shrinking today, according to a team analyzing new images from NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft.
Scientists have argued about the origins of Mercury's smooth plains and the source of its magnetic field for more than 30 years.
- Stoppage; cessation (of labor).
- A standing still or idling (of mills, factories, etc.).