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en.wikipedia.org/wiki/Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought ... For example, gravity causes the Earth and the other planets to orbit the Sun, it also causes the Moon to orbit the Earth, and causes the formation of ...

math.ucr.edu/home/baez/physics/Relativity/GR/gravity.html

... do with gravity? It is quite simple! When a mass is present in the above space- time it distorts it so that whilst it remains true that travelling through space causes  ...

spaceplace.nasa.gov/what-is-gravity

The answer is gravity: an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.

www.livescience.com/1770-greatest-mysteries-gravity.html

Aug 10, 2007 ... Science can measure gravity, but its source eludes discovery. ... This weakness also makes it the most mysterious, as scientists can't measure it ...

www.universetoday.com/75705/where-does-gravity-come-from

Dec 5, 2013 ... The old adage, “everything that goes up must come down” makes perfect sense to ... So, what is gravity and where does it come from?

physics.stackexchange.com/questions/155004/what-is-gravity-and-what-causes-objects-to-act-against-it

Dec 25, 2014 ... Objects not being affected by forces move on straight lines in euclidean space. If space is curved, there will not be straight lines, and particles ...

van.physics.illinois.edu/qa/listing.php?id=175

The interpretation in Einstein's viewpoint is that there is no "force" of gravity at .... that gravity is *due to* the earth's spin, the only connection I am able to make is ...

www.dailyherald.com/article/20120124/news/701249876

Jan 24, 2012 ... We know gravity exists because of what doesn't happen. When we wake up we're still in our beds, not floating near the bedroom ceiling.

sciencing.com/causes-gravity-earth-8579888.html

Apr 25, 2017 ... The gravity of the Earth is what keeps humans from floating to other massive ... The centripetal force makes it such that someone on the Earth's ...