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What is gravity? - NASA 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 The gravitational equation says that the force of gravity is proportional to the product of the two masses (m 1 and m 2 ), and inversely proportional to the square of the distance
Matter in Motion: Earths Changing Gravity | NASA Earthdata This map, created using data from the Gravity Recovery and Climate Experiment (GRACE) mission, reveals variations in the Earth's gravity field Dark blue areas show areas with lower than normal gravity, such as the Indian Ocean (far right of image) and the Congo river basin in Africa Dark red areas indicate areas with higher than normal gravity
StarChild: Glossary - NASA A cluster of stars, dust, and gas held together by gravity GAMMA-RAYS Penetrating short wave electromagnetic radiation of very high frequency GEOSYNCHRONOUS An orbit in which a satellite's rate of revolution matches the Earth's rate of rotation This allows the satellite to stay over the same site on the Earth's surface at all times
Getting at Groundwater with Gravity | NASA Earthdata This project, called the Gravity Recovery and Climate Experiment (GRACE), measures changes in the Earth’s gravity But how do gravitational differences tell scientists about the presence of groundwater? If the Earth were a perfectly round sphere, any point on the planet’s surface would have the same average gravity field
How do we know that dark matter exists? - NASA 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 (invisible to direct observation) matter, interacting gravitationally with the normal, visible matter in the universe, exists
Glacier Power: How do Glaciers Move? | NASA Earthdata The ice flows like a conveyor belt driven by gravity and ever mounting snows Ablation Zone: Where the glacier loses ice through melting, calving, and evaporation Output Zone: In this zone, the glacier loses ice This is the lower region of the glacier Meltwater flows out to the terminus through hidden channels and tunnels Oldest ice is the
StarChild: Glossary - NASA GRAVITY The invisible force between objects that makes objects attract each other GRAVITATIONAL PULL The attraction that one object has for another object due to the invisible force of gravity H HURRICANE A very, very strong windstorm where the wind blows in circles at more than 46 kilometers per hour Heavy rains often come with the winds I J K
StarChild: Galaxies - NASA 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 may be in a large group of galaxies called a "supercluster" Galaxies are classified by scientists according to their shape and appearance
Where did the Moon come from? - NASA StarChild Question of the Month for October 2001 Question: Where did the Moon come from? Answer: Any theory which explains the existence of the Moon must naturally explain the following facts:
Sir Isaac Newton - NASA As the years progressed, Newton completed his work on universal gravitation, diffraction of light, centrifugal force, centripetal force, inverse-square law, bodies in motion and the variations in tides due to gravity His impressive body of work made him a leader in scientific research