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Astronomers have obtained observations of the smallest asteroid ever characterized in detail. At 2 meters (6 feet) in diameter, the tiny space rock is small enough to be straddled by a person in a hyp...
Variation of Central Star Masses in Planetary Nebulae with Height above the Galactic Plane
Central Star Masses Planetary Nebulae Galactic Plane
2009/6/18
Variation of Central Star Masses in Planetary Nebulae with Height above the Galactic Plane。