ISSN: 2320-2459

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# Introduction to Gravity of Earth and Origin of Radiation

Alexis Sims*

1Department of Physics, Institute of Science and new Technology, Tehran, Iran

*Corresponding Author:
Sims Alexis
Department of Physics, Institute of Science and new Technology, Tehran, Iran
E-mail:
Sims931@gmail.com

Received: 19-Sep-2022 Manuscript No. JPAP-22-52605; Editor assigned: 22- Sep-2022 Pre QC No. JPAP-22-52605(PQ); Reviewed: 06-Oct-2022, QC No. JPAP-22-52605; Revised: 13-Oct-2022, Manuscript No. JPAP-22-52605(R) Published: 20-Oct-2022, DOI:10.4172/2320-2459.10.S4.002.

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Every planetary body is surrounded by its own gravitational field, which can be conceptualized with Newtonian physics as exerting an attractive force on all objects. Assuming a spherically symmetrical planet, the strength of this field at any given point above the surface is proportional to the planetary body's mass and inversely proportional to the square of the distance from the centre of the body.

The strength of the gravitational field is numerically equal to the acceleration of objects under its influence. The rate of acceleration of falling objects near the Earth's surface varies very slightly depending on latitude, surface features such as mountains and ridges, and perhaps unusually high or low sub-surface densities. For purposes of weights and measures, a standard gravity value is defined by the International Bureau of Weights and Measures, under the International System of Units (SI).

The force of gravity on Earth is the resultant (vector sum) of two forces; (a) The gravitational attraction in accordance with Newton's universal law of gravitation, and (b) the centrifugal force, which results from the choice of an earthbound, rotating frame of reference. The force of gravity is weakest at the equator because of the centrifugal force caused by the Earth's rotation and because points on the equator are furthest from the center of the Earth. The force of gravity varies with latitude and increases from about 9.780 m/s2 at the Equator to about 9.832 m/s2 at the poles. Canada's Hudson Bay has less gravity than any place on Earth.

Origin

The earliest gravity possibly in the form of quantum gravity, supergravity or a gravitational singularity, along with ordinary space and time, developed during the Planck epoch up to 10−43 seconds after the birth of the Universe, possibly from a primeval state, in a currently unknown manner.