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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
Gravity Gravitational Field - NASA Earthdata Gravity Gravitational Field Data from NASA satellite observations provide information about Earth's mean gravity field and inform monthly maps of the time-variable gravity field, both of which are useful tools for scientists as they study the planet's changing climate
StarChild: Glossary - NASA GRAVITATIONAL PULL See Gravity GRAVITY The force of attraction between two objects which is influenced by the mass of the two objects and the distance between the two objects GYROSCOPE A heavy wheel or disk mounted so that its axis can turn freely in one or more directions A spinning gyroscope tends to resist change in the direction of its axis
Glacier Power: How do Glaciers Move? - NASA Earthdata Glaciers Are Solid Rivers 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
Teachers Center Activity: Gravity Effects on Planet Motion - NASA 1 Introduction: Review the definition of gravity Drop a ball and explain why it falls downward Explain that the strength of a gravitational pull is determined by the masses of the objects involved and the distance between the objects Hold up a scale model of Earth and a scale model of the Sun Inquire as to which object would exert a stronger pull
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
Physical Oceanography DAAC | NASA Earthdata NASA's Physical Oceanography Distributed Active Archive Center (PO DAAC) specializes in providing tools and services for NASA's oceanographic and hydrologic data (satellite, airborne, and in-situ) for the greater understanding of the physical processes and conditions of the global oceans and surface land waters Located at NASA's Jet Propulsion Laboratory in Pasadena, California, PO DAAC
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