At the end of the 18th century, the British scientist Henry Cavendish measured the force of gravity between two objects for the first time in a laboratory. The objects in question were lead balls, one ...

The Force is With You? You may have heard that gravity isn't a force. This is true. Gravity is not a force; however, this truth leaves us with a number of questions. For example, we're commonly told ...

Although gravity seems strong in our everyday lives, such as when lifting a heavy object, it is the weakest of the four fundamental forces. The gravitational force between two bodies is proportional ...

If the universe contains more than three spatial dimensions, as many physicists believe, our current laws of gravity should break down at small distances Nothing seems more certain than the “fact” ...

There are quite a few fundamental constants. These are things like the speed of light (c) the charge on an electron (e), and the Planck constant (h). These constants are determined with some type of ...

Physicist Markus Aspelmeyer vividly remembers the day, nearly a decade ago, that a visitor to his lab declared the gravitational pull of his office chair too weak to measure. Measurable or not, this ...

Even teeny objects obey the law of gravity. A gold ball just 2 millimeters wide, with a mass of about 90 milligrams, is now the smallest object to have its gravitational pull measured. Observations of ...

This is a great question. It comes up quite often. If you ask the people around you, there are two common answers: Astronauts float around in space because there is no gravity in space. Everyone knows ...