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"If an apple falls, does the moon also fall?"

This question triggered the discovery and understanding of gravity, by Sir Isaac newton. He devised an equation to theorise gravity:

F=GMm/r2.

G = universal gravitational constant, 6.673x10-11

M,m = masses of the two objects gravitationally attracting each other

r = distance between objects


This was a very close approximation for the time being, and in fact even today, but after Einstein's Theories of Special and General Relativity, gravity would never be lookad at the same way again.


Einstein developed 10 field equations which better explain space-time as a fabric, and postulated that gravity is caused by warps in this fabric caused by large masses.


This therefore meant that gravity warps the flow of time - and that objects with extremely strong gravitational fields such as black holes slow down time around them.


Some of the most recent ideas, thoughts and theories on gravity arose from the Standard Model, which claims that the force of gravity is mediated by light-speed particles called Gravitons.


This would mean that if the sun were to suddenly disappear, we would not only receive its light for 8 minutes and 20 seconds after it vanished, but we would also continue moving in orbit for this time, after which the night sky would become visible and the Earth would begin moving in a straight line.


Gravitons are mysterious particles that have not yeet been discovered or observed, but are known to be massless, since gravity has an infinite range.

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Why does mass attract mass - what is the science behind it?

Mass attracts mass due to gravity, which is a fundamental force in the universe. According to the theory of general relativity, mass warps the fabric of spacetime, causing objects with mass to be drawn towards each other. This attraction is what we experience as gravity.


Did Albert Einstein know about gravity?

Yes, Albert Einstein developed the general theory of relativity, which explains how gravity works as a curvature of spacetime caused by mass. His work significantly advanced our understanding of gravity.


When did gravity come?

Gravity has been around as long as there has been mass. They come together; you can't separate them.


Why can't humans live without gravity?

Because, since gravity is all around and everywhere all the time, we evolved to live with it, and if you suddenly changed the environment of physical laws and forces to which we spent millions of years adapting ourselves, then naturally we would have a tough time making the sudden change. On the other hand, it has been clearly demonstrated that humans CAN live without gravity, at least for a time. Astronauts in orbit and in transit to and from the moon do not experience the effects of gravity, yet live quite well vor months at a time - in the space station, for example.


How do you calculate payback time in years - science?

To calculate payback time in years, divide the initial cost of the investment by the annual savings or benefits generated by the investment. The result will give you the number of years it will take for the investment to pay for itself.

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