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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 is the field around physical bodies, such as planets, that draws objects toward its center Earth's gravitational field can be measured by orbiting satellites that can detect changes to it These variations are related to change or transportation of mass, which can provide information on ocean circulation, glacial melt, droughts, or geodesy
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
A Snag in Space-Time | NASA Earthdata To account for gravity and other effects in their equations, the scientists used a model of Earth’s gravitational field, based on data from the GRACE satellite mission The GRACE mission, like LAGEOS, happens to rely on two identical satellites However, the similarities between the missions end there
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
StarChild: Stars - NASA Gravity causes the last of the star's matter to collapse inward and compact This is the white dwarf stage which is extremely dense White dwarfs shine with a white hot light but once all of their energy is gone, they die The star has now reached the black dwarf phase
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
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
The Precision Behind Sea Level Rise - NASA Earthdata Gravity is not constant across Earth, and the amount of force exerted by gravity changes with changes in mass These uneven mass distributions influence satellite trajectories since areas of higher mass exert more force than areas of lower mass (from Newton’s Second Law of Motion: Force = mass x acceleration or F = ma)