Meridians
Great circles that pass through both the north and south poles, also called lines of longitude.
Great circles that pass through both the north and south poles, also called lines of longitude.
An entry in a catalog of 103 star clusters, nebulas, and galaxies compiled by French comet hunter Charles Messier (mess-YAY) ...
The Mars Environmental Survey project at JPL, the engineering prototype of which was originally called MESUR Pathfinder, later Mars Pathfinder.
A term used by astronomers to describe all elements except hydrogen and helium, as in "the universe is composed of ...
A brief streak of light caused by a small piece of solid matter entering Earth's atmosphere at tremendous speed (typically ...
A meteor shower is when an unusual amount of meteors—or shooting stars—flash across the night sky over a period, usually ...
A meteorite is the name for a space rock or meteoroid which has survived falling through the atmosphere and has ...
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