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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
- 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
- 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 Motion Ice Sheet Motion | NASA Earthdata
Glaciers move because the ice deforms and flows due to the tug of gravity As glaciers flow, they mold to the shape of land but also shape the land like an icy bulldozer The downhill, forward motion grinds and erodes the rocky bed the glacier slides on, forming sediment
- StarChild: Galaxies - NASA
A galaxy contains stars, gas, and dust which are held together as a group by gravity There may be millions, or even billions, of stars in one galaxy There are billions of galaxies in the universe Galaxies are labeled according to their shape Some galaxies are called "spiral", because they look like giant pinwheels in the sky
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