This article is in spanish but is still news below is my writing and following is my tranlation.
I believe this story is news worthy even though it is not directly published in our country because Newton's Laws of Gravity are still important to us especially for people studying physics. The lead of the article is not at all passive because it starts off by saying proposed. The article is about a group of astrophysicists challenging Newton's Laws based on their own experiments and research. It is not as if a group of people met to randomly contradict an inportant subjec. This topic is very delicate because the reporters writing this story must be sure of what they are writing or they can send the wrong message to its readers especially because the subject is a worldly accepted scientific theory. The article has no written author because it is a news agency which could mean that the paper collects stories from other journalists. The fact that it doesnt name the author is harmful to the credibility to the article because the readers may not want to take into consideration the truthfulness or it. The article is overall news worthy because it deals with a topic that affects the entire world and doesn't only spotlight the investigators but instead they spotlight he importance.
Mexico, F.D. , September 30, 2010 (EL Universal) - "The mexican astrophysicists Sergio Mendoza and Xavier Hernandez proposed to reform Newton's Universal Law of Gravity for the new Extended Gravity.
The new position taken by the investigators of the Institute of Astronomy at the UNAM explains a series of inconsistencies between the observed phenomenon at distant galaxies and the predicted behavior by the classic theory.
This new formulation published in the magazines Astronomy & Astrophysics and in Monthly Notices of the Royal Astronomical Society offers a new expression for the force of gravity, resulting indistinguishable from Newton's Law as it relates to the solar System but at galactic levels declines much slower than indicated by the English physicist.
The mexicans make an example of the spiral galaxies which rotate faster than expected, so much that the stars and gases that compose them should be released when spining like a water spout.
However the force that keeps them united compensates the centrifugal originated by the rotating movement.
The dominant models to explain this discrepency consist of postulating that there is more matter than is observed, the so called dark matter whose gravitational force should keep the galaxy united.
But should posses exotic properties such as not absorbing light or releasing it, traspassing ordinary matter, occupying great extensions of space without becoming bulky and composing 90% of the universe's matter.
They explore the alternate path The Universal Law of Gravity proposed by Newton in 1687 in his book Mathematical Principles of Natural Philosophy, which establishes a quantitative relationship for the force of attraction between two objects of mass.
It sustains that all objects in the universe possesing mass have a gravitational attraction over any other object with mass even if they are separated by great distances as it occurs with binary stars which are associated but still far apart from each other.
Mendoza and Hernandez have explored an alternate path that discards the existance of dark matter.
They infer that the attractive force produced by the observed matter at distant galaxies is greater than it is supposed to be.
This approach recommended by Newton himself: find the forces that control the movement of the astros instead of postulating exotic substance.
Which can be found in the preface of the second edition of his book.
The scientists also present comparable proof across all astronomical scales with results in the best measurements of margin of error made until today including those of the position and movement of the Solar System which have a fractional precision of upto a part of a billion.
Likewise they present verfiable predictions for actual problems.
This result replaces the vision of the cosmos for the last thirty years since Fritz Zwicky and Vera Rubin proposed the existence of dark matter.
The Extended Gravity opens new areas of investigation such as searching for its realistic version, review the consequences of space and its expansion, and find an answer to the problem of dark matter.
For more than thirty years investigative groups unsatisfied with the theory of dark matter, have worked on alternative gravitational models.
Part of them have followed the Modified Dinamic Models by Mordehai Milgrom of 1981 who placed a change in Newton's Second Law (describes the dinamic of a massive object accelerated by the action of a force) for those systems that suffered minor accelerations bit the Modified Dinamic Models hace resulted to be difficult to apply.
Hernandez and Mendoaza alongside their team composed of the postdoctoral investigator Juan Carlos Hidalgo and the Ph.D. and masters students,Tula Bernal and Teresita Suarez, have proposed an alternative equivalent to Modified Dinamic Models through developing Newton's powers of gravitational forces known as F= GMm/r2.
The Extended Gravity details the force felt by objects at astronomical distances.
It coincides with the proposed description by Newton for the Solar System and those of the Modified Dinamic Models for galactic systems.
Besides it finalizes the force felt by intermediate systems like eliptic galaxies."
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