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2. Isaac Newton's apple tree - Wikipedia

   en.wikipedia.org/wiki/Isaac_Newton's_apple_tree

   Isaac Newton's apple tree at Woolsthorpe Manor represents the inspiration behind Sir Isaac Newton's theory of gravity. While the precise details of Newton's reminiscence (reported by several witnesses to whom Newton allegedly told the story) are impossible to verify, the significance of the event lies in its explanation of Newton's scientific thinking.

3. Ceres (dwarf planet) - Wikipedia

   en.wikipedia.org/wiki/Ceres_(dwarf_planet)

   Ceres ( minor-planet designation: 1 Ceres) is a dwarf planet in the middle main asteroid belt between the orbits of Mars and Jupiter. It was the first known asteroid, discovered on 1 January 1801 by Giuseppe Piazzi at Palermo Astronomical Observatory in Sicily, and announced as a new planet.

4. GRACE and GRACE-FO - Wikipedia

   en.wikipedia.org/wiki/GRACE_and_GRACE-FO

   The Gravity Recovery and Climate Experiment ( GRACE) was a joint mission of NASA and the German Aerospace Center (DLR). Twin satellites took detailed measurements of Earth's gravity field anomalies from its launch in March 2002 to the end of its science mission in October 2017. The two satellites were sometimes called Tom and Jerry, a nod to ...

5. History of gravitational theory - Wikipedia

   en.wikipedia.org/wiki/History_of_gravitational...

   In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass. There have been numerous theories of gravitation since ancient times. The first extant sources discussing such theories are found in ancient Greek philosophy. This work was furthered through the Middle Ages by Indian, Islamic ...

6. Normal force - Wikipedia

   en.wikipedia.org/wiki/Normal_force

   Normal force. In mechanics, the normal force is the component of a contact force that is perpendicular to the surface that an object contacts, as in Figure 1. [1] In this instance normal is used in the geometric sense and means perpendicular, as opposed to the common language use of normal meaning "ordinary" or "expected".

7. Center of mass - Wikipedia

   en.wikipedia.org/wiki/Center_of_mass

   In physics, the center of mass of a distribution of mass in space (sometimes referred to as the barycenter or balance point) is the unique point at any given time where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular ...