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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
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
ASDC Direct Data Download - NASA Earthdata NASA ASDC's Direct Data Download tool provides the ability to access and download all publicly available data collections via https
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
StarChild: Galaxies - NASA A galaxy is a cluster of stars, dust, and gas which is held together by gravity Galaxies are scattered throughout the universe and they vary greatly in size A galaxy may be alone or it may be in a large group of galaxies called a "supercluster" Galaxies are classified by scientists according to their shape and appearance An irregular galaxy has an undefined shape and is full of young stars
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
A Snag in Space-Time | NASA Earthdata An artistic rendering shows that Earth’s rotation has dragged space-time with it A particle dropping from infinity towards the center of the planet would not fall in a straight line; it would be dragged along a curved path In the foreground, the Laser Geodynamics Satellites (LAGEOS) spin in an orbit high above Earth In the background, the Gravity Recovery and Climate Experiment (GRACE