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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 (r) between their centers of mass Mathematically
- Matter in Motion: Earths Changing Gravity - NASA Earthdata
A new satellite mission sheds light on Earth's gravity field and provides clues about changing sea levels
- Getting at Groundwater with Gravity - NASA Earthdata
NASA’s twin Gravity Recovery and Climate Experiment (GRACE) satellites can detect groundwater by measuring subtle variations in Earth’s gravity This image shows the world’s average annual cycle of water storage on land, computed from four years of GRACE gravity data Colors indicate how much groundwater comes and goes, each year, in various regions; red indicates high levels of annual
- Matter in Motion: Earths Changing Gravity - 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
- The Case of the Missing Waves - NASA Earthdata
Gravity waves are a real challenge because they are largely invisible to climate and weather models The crux of the problem is the way satellites see them Satellite instruments sweep the atmosphere in either a vertical or horizontal plane, so their measurements are either one- or two-dimensional
- Glacier Power: How do Glaciers Move? | NASA Earthdata
A glacier is a large accumulation of many years of snow, transformed into ice This solid crystalline material deforms (changes) and moves Glaciers, also known as “rivers of ice,” actually flow Gravity is the cause of glacier motion; the ice slowly flows and deforms (changes) in response to gravity A glacier molds itself to the land and also molds the land as it creeps down the valley
- 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
- Gravity Wave - NASA Earthdata
A wave disturbance in which buoyancy acts as the restoring force on parcels displaced from hydrostatic equilibrium
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