radius of the star. The surprising result I found was, after applying it to the stars of all spectral types
from F through K, with their different radii and luminosities (the luminosities determine , the
distances to the habitable zones), that the radius of the planet always came out about the same, about the
radius of the Earth. This may suggest optimally habitable planets are not just a function of the distance
from the star, which determines their temperature, but are functions of their size and mass probably
because they are good for life chemistry, atmospheric composition, and gravity when they are the size and
mass of the Earth.
In order to get , the distance of the habitable planet from the star, we use the inverse square law for
luminosity of the star. If the Earth is in the habitable zone, and if the star is one hundred times brighter
than the Sun, then by the inverse square law the distance to the habitable zone of the planet is 10 times
that of what the Earth is from the Sun. Thus we have in astronomical units the habitable zone of a star is
given by:
the luminosity of the star, and the luminosity of the Sun. We compute the orbital radius of the
Moon…
Which works for our Solar System, Ag and Au the relative masses of silver and gold atoms.
References
[1] CODATA Internationally recommended values of the Fundamental Physical Constants (2018)
[2] Particle Data Group - Review of Particle Physics (2022)
[3] Planck Collaboration - Cosmological parameters (2018)
[4] Ashby, N. - Relativity in the Global Positioning System (2003)
[5] Pohl, R., et al. - The size of the proton (2010) Nature
[6] Xiong, W., et al. - A small proton charge radius from electron–proton scattering (2019) Nature
[7] Bezginov, N., et al. - A measurement of the atomic hydrogen Lamb shift and the proton charge radius (2019)
Science
[8] Alexander Thom - Megalithic Sites in Britain (1967)
[9] Kepler Mission data on exoplanet characteristics
[10] ALMA observations of protoplanetary disks
[11] Big Bang Nucleosynthesis theoretical frameworks
[12] Biological timing and metabolic rate studies
[13] Fibonacci sequences in physical and biological systems
[14] Quantum gravity theoretical approaches
[15] General Relativity textbook references