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 …
Gravity/Gravitational Field - NASA Earthdata
Nov 21, 2025 · 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. …
Matter in Motion: Earth's Changing Gravity | NASA Earthdata
Dec 28, 2020 · A new satellite mission sheds light on Earth's gravity field and provides clues about changing sea levels.
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 …
Glacier Power: How do Glaciers Move? - NASA Earthdata
Nov 21, 2025 · 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 …
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 …
ASDC Direct Data Download | NASA Earthdata
Nov 21, 2024 · NASA ASDC's Direct Data Download tool provides the ability to access and download all publicly available data collections via https.
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 …
Getting at Groundwater with Gravity - NASA Earthdata
Dec 28, 2020 · NASA’s twin Gravity Recovery and Climate Experiment (GRACE) satellites can detect groundwater by measuring subtle variations in Earth’s gravity. This image shows the world’s average …
Crustal Dynamics Data Information System | NASA Earthdata
Nov 14, 2012 · NASA's Crustal Dynamics Data Information System (CDDIS) provides data and information to support the international space geodesy community.