_____________________________________________________________________________________________________ *Corresponding author: E-mail: chuksemerie@yahoo.com; International Astronomy and Astrophysics Research Journal 4(2): 1-7, 2022; Article no.IAARJ.83815 Unification of Extragalactic Radio Sources and Re- Acceleration of Radio Jets Ezeugo Jeremiah Chukwuemerie a* a Department of Physics and Industrial Physics, NnamdiAzikiwe University, Awka, Anambra State, Nigeria. Author’s contribution The sole author designed, analysed, interpreted and prepared the manuscript. Article Information Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/83815 Received 20 January 2022 Accepted 30 March 2022 Published 02 April 2022 ABSTRACT We use statistical methods of analysis to show that Large extended extragalactic radio sources (large EGRS) and compact steep spectrum (CSS) sources are similar sources evolving in different environments. Because of the diversity of their ambient media, one suffers higher magnitude of jet re-acceleration than the other. Linear regression analysis of observed source linear sizes, , of large extended extragalactic radio quasars against their individual observed redshifts,  was carried out. With appreciable correlation coefficient, result shows that  relates with redshift according to the equation,       ; where  is a constant. The relation shows that projected source size is smaller at earlier epoch in the evolution of the universe. In addition, if we take  to be distance between any two points in space, then the relation may mean that the diameter of the universe is smaller at earlier epoch of its evolution. Moreover, with some plausible assumption, we find that jet velocity may be written as,           . This indicates that mechanism of jet production derives from the source central core (presumed to house a super massive blackhole), as well as, from cosmic evolution. Since cosmic evolution is propelled by dark energy, the relation simply shows that dark energy enhances jet expansion more than blackhole power. Dark energy creates more empty spaces. It is anti-gravity in nature, and is believed to be the driving force behind cosmic dilation. Moreover, we estimate the magnitude of the effect of dark energy on the jet expansion to be three times the effect caused by blackhole power. Therefore, this result suggests that in addition to other factors, a culprit for re-acceleration mechanism for radio jets is dark energy. In order to check the authenticity of the assertion, we carry out linear regression analyses of Original Research Article