The Past, Present and the Futuristic Earth-Moon Orbital-Globe Dynamics -
and its habitability
Abstract
Using Advanced Kinematic Model (AKM), the unfolding of Earth’s
eco-system under the influence of the evolving tidally interacting
Earth-Moon System (E-M system) is studied. E-M system is born 4.467Gy
ago at inner geo-synchronous orbit (aG1 = 15,000Km)
which is a Total Energy Maxima Hill Top ( +4.18x10^30J). E-M system
tidally evolves to its final interlocking orbit in 97Gy from NOW at
outer geo-synchronous orbit (aG2 = 534,590.6Km) which is
Total Energy Minima Valley ( - 2.64x10^28J). Tidal evolution is
accompanied with synchronization and circularization of Moon’s orbit but
co-planarization with Ecliptic plane remains unachievable due to weak
tidal coupling between Earth and Moon. E-M system falls in Cassini State
1 in 214My from NOW. In 992.56My from NOW Moon’s ‘orbit’ gets completely
circularized and synchronized. In 1.1Gy Sun’s brightness increases 10%
and Earth becomes moist green house planet . In 1.3458Gy from NOW Earth
Obliquity angle reaches an eco-hostile value of 30.42⁰ with complete
destruction of Habitat trinity. In 2Gy from NOW due to Moon’s resonance
passage there is large oscillations of obliquity and severe climatic
alterations. In 3.5Gy Sun’s brightness increases 40% and Earth becomes
a runaway green house planet reducing to a molten remnant. If E-M system
survives Red Giant Branch stage, Thermal Pulse-Asymtotic Giant Branch
stage, the Planetary Nebular phase and if it survives the present phase
of Big-Bang of our Bouncing Universe then in 97Gy from NOW Moon will get
interlocked with Earth in a triple synchrony orbital period of 44.7473 d
at aG2 = 534,590.6Km.