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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
- 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
- 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
- StarChild: Stars - NASA
It is in the clouds of dust and gas that stars are born As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin The gas atoms start to bump into each other faster and faster This creates heat energy The cloud gets hotter and hotter
- 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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