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Newton's law of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations A new satellite mission sheds light on earth's gravity field and provides clues about changing sea levels. Gravity is the field around physical bodies, such as planets, that draws objects toward its center Earth's gravitational field can be measured by orbiting satellites that can. See gravity gravity the force of attraction between two objects which is influenced by the mass of the two objects and the distance between the two objects Discover hidden value in your. The cluster does not behave as scientists would expect it to if only the visible matter is generating the gravity present in the cluster 'dark matter' theory suggests that a huge amount of dark. A galaxy is a cluster of stars, dust, and gas which is held together by gravity Galaxies are scattered throughout the universe and they vary greatly in size A galaxy may be alone or it. The moon's low density (3.3 g/cc) shows that it does not have a substantial iron core like the earth does Moon rocks contain few volatile substances (e.g Review the definition of gravity drop a ball and explain why it falls downward explain that the strength of a gravitational pull is determined by the masses of the objects.