explain the concept of gravitional field in space  and its effects on our universe?i want to know the clear concept of gravitional field  in space  and its effect on any thing in space planets,...

explain the concept of gravitional field in space  and its effects on our universe?

i want to know the clear concept of gravitional field  in space  and its effect on any thing in space planets, stars black hole etc

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felquilem's profile pic

felquilem | College Teacher | (Level 2) Adjunct Educator

Posted on

I like this question...the concept of gravitational field is not at all clear.  Isaac Newton sought to explain our observations of planetary motion (we say the sun rises in the east and sets in the west, we say the moon travels around the earth). He suggested that all earthbound observations indicate that objects stay at rest unless forced to move.  If we attempt to alter the direction of an object that is moving, we must apply some force.  If the earth is moving around the sun, then some force must be constantly moving the earth toward the sun.  Apparently this force is working between any two solid masses.  Since the force is not directed in one direction, it is considered a field force. The strength of this force is proportional to the masses involved and inversely proportional to the distances. This gravitational attraction appears to be at work on all the bodies in the known universe.

nessus's profile pic

nessus | High School Teacher | (Level 2) Adjunct Educator

Posted on

It is indeed one of the reasons the LHC at CERN was built: to find the Higgs boson.

The Newtonian idea is that for some reason (no one knows) all masses exert a pulling force on each other, for every mass in the universe.

The Einsteinian idea is that space is distorted by a mass. You have surely seen the model of a flat, stretched, infinitely, endlessly elastic rubber sheet with a massive sphere at its center. Put a very small but massive sphere in the center. A neutron star. Increase the mass but make it much smaller (and denser). The dent in the rubber is very narrow and deep. For a black hole the mass can be finite (measurable) but the depth of the dent is infinite. This is a black hole gravity well. Try now to imagine the same situation but in 3D.

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