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Despite the low theoretical abundance of lithium, the actual observable amount is less than the calculated amount by a factor of 3–4. [8] This contrasts with the observed abundance of isotopes of hydrogen (1 H and 2 H) and helium (3 He and 4 He) that are consistent with predictions. [2] Abundances of the chemical elements in the Solar System.
Countries build nuclear triads to eliminate an enemy's ability to destroy a nation's nuclear forces in a first-strike attack, which preserves their own ability to launch a second strike and therefore increases their nuclear deterrence. [2] [3] [4] Only four countries are known to have the nuclear triad: the United States, Russia, India, and China.
The fraction of the total energy density of our (flat or almost flat) universe that is dark energy, , is estimated to be 0.669 ± 0.038 based on the 2018 Dark Energy Survey results using Type Ia supernovae [7] or 0.6847 ± 0.0073 based on the 2018 release of Planck satellite data, or more than 68.3% (2018 estimate) of the mass–energy density ...
A successful large-scale simulation of the evolution of galaxies, with results consistent with what is actually seen by astronomers in the night sky, provides evidence that the theoretical underpinnings of the models employed, i.e., the supercomputer implementations ΛCDM, are sound bases for understanding galactic dynamics and the history of the universe, and opens avenues to further research.
In physical cosmology, Big Bang nucleosynthesis (also known as primordial nucleosynthesis, and abbreviated as BBN) [1] is a model for the production of light nuclei, deuterium, 3 He, 4 He, 7 Li, between 0.01s and 200s in the lifetime of the universe. [2] The model uses a combination of thermodynamic arguments and results from equations for the ...
Physical cosmology is a branch of cosmology concerned with the study of cosmological models. A cosmological model, or simply cosmology, provides a description of the largest-scale structures and dynamics of the universe and allows study of fundamental questions about its origin, structure, evolution, and ultimate fate. [1]
Bruce Leonard Cathie (11 February 1930 – 2 June 2013) was a New Zealand airline pilot who wrote seven books related to flying saucers and a "World energy grid".. His central thesis was that he could use mathematics to describe a grid-like pattern on Earth (i.e. the Electro-dynamic field on Earth) that powers flying saucers and controls the dates and places where nuclear bombs can function ...
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