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  2. 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 …

  3. 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.

  4. 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. …

  5. 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 …

  6. Glacier Power: How do Glaciers Move? | NASA Earthdata

    3 days ago · 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,” …

  7. Glacier Power: What is a Glacier? - NASA Earthdata

    3 days ago · A glacier is a huge mass of many years of snow, ice, rock, sediment, and water. It originates on land and moves down slope under the influence of its own weight and gravity. …

  8. 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 …

  9. 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 …

  10. 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 …

  11. StarChild: Stars - NASA

    As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin. The gas atoms start to bump into each other faster and faster. This …