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 …
Matter in Motion: Earth's Changing Gravity - NASA Earthdata
2020年12月28日 · 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. …
Glacier Power: How do Glaciers Move? - NASA Earthdata
6 天之前 · 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,” …
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 …
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 …
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 …
StarChild: Glossary - NASA
GRAVITY The invisible force between objects that makes objects attract each other. GRAVITATIONAL PULL The attraction that one object has for another object due to the …
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.
Getting at Groundwater with Gravity - NASA Earthdata
2020年12月28日 · Publication from NASA ESDIS describing research uses of data from EOSDIS - scientists use a pair of new satellites to keep up with groundwater resources.