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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: Stars - NASA
The last of the hydrogen gas in the outer shell is blown away to form a ring around the core This ring is called a planetary nebula When the last of the helium atoms in the core are fused into carbon atoms, the medium size star begins to die Gravity causes the last of the star's matter to collapse inward and compact
- 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
- 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
- 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
- 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
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