Authors: Nainan K. Varghese
Comments: 12 Pages.
Currently, ‘central force’ – an apparent effort between two free macro bodies along the line joining them – is estimated in relative frames of reference. It is also assumed that action by ‘central force’ directly corresponds to its magnitude. Estimation of magnitude and direction of ‘central force’ on planetary bodies or central body, in a planetary system, assumes that the center of planetary system is static in space. While considering a satellite’s orbital path, center of corresponding planet is assumed static in space. Although such calculations help to determine relative positions of these macro bodies, it obscures causes and magnitudes of many other important phenomena, related to planetary motion. Determining magnitude and direction of ‘central force’ and its action with respect to absolute reference can give us logical explanations to many puzzling phenomena on planetary motions/systems.
Authors: José Francisco García Juliá
Comments: 5 Pages.
A single tired light mechanism has been proposed for explaining the cosmological
redshift without expansion of the universe and also the intrinsic redshift, that is, the
excess of redshift of the radio sources. In this note of widening, we show that the
mechanism would be similar to the discharge of an electric capacitor, to the radiation
loss by fast electrons and to the radioactive nuclei decay.
Authors: Ashwini Kumar Lal
Comments: 16 pages, 2 figures, published in 'Journal of Cosmology', 2010, vol.5, pp.801-810 ; also archived at ARXIV as arXiv: 0912.1040
Earth is the only known inhabited planet in the universe to date. However, advancements in the fields of astrobiology and observational astronomy, as also discovery of large varieties of extremophiles with extraordinary capability to thrive in harshest environments on Earth, have led to speculation that life may possibly be thriving on many of the extraterrestrial bodies in the universe. Coupled with the growing number of exoplanets detected over the past decade, the search for the possibility of life on
other planets and satellites within the solar system and beyond has become a passion as well as a challenge for scientists in a variety of fields. This paper examines such possibility in the light of findings of the numerous space probes and theoretical research undertaken in this field over the past few decades.
Authors: Ashwini Kumar Lal
Comments: 32 pages, 8 figures, invited review article (published in Astrophysics & Space Science, 2008, volume 317, issue 3-4, pp.267-278), minor addition
The evolution of life has been a big enigma despite rapid advancements in the fields of
biochemistry, astrobiology, and astrophysics in recent years. The answer to this puzzle has been
as mind-boggling as the riddle relating to evolution of Universe itself. Despite the fact that panspermia has gained considerable support as a viable explanation for origin of life on the Earth and elsewhere in the Universe, the issue remains far from a tangible solution. This paper
examines the various prevailing hypotheses regarding origin of life like abiogenesis, RNA world,iron-sulphur world, and panspermia; and concludes that delivery of life-bearing organic molecules by the comets in the early epoch of the Earth alone possibly was not responsible for kick-starting the process of evolution of life on our planet.