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VISIBLE MATTER. “Baryons, however, are tightly coupled to photons until decoupling, at tdec ≈ 0.4 Myr and therefore perturbations in baryons can only grow after decoupling. Consequently in a universe without non-baryonic DM the initial density perturbations have to be larger, and produce larger temperature fluctuations in the CMB, ∆T/T ∼ 10(-4), for observed structures to form.” (DM = dark matter; CMB = cosmic microwave background). https://lnkd.in/e6ifiQMn View in LinkedIn

FRAGMENT FROM NATURE continues from last weekend and concludes tomorrow on the theme of the physiological reason for the extinction of the dinosaurs. Such an existential threat from a meteor strike on our planet is very real, as one glance at the pockmarked surface of the moon will confirm. The universe is violent and unpredictable, on scales beyond our ability to change, so hurry about your business without a care. View in LinkedIn

PRESENT BY ABSENCE. “The detailed scale dependence of the temperature anisotropies in the CMB allow the total, matter and baryon density parameters to be measured precisely. However the measured typical amplitude of the fluctuations, ∆T/T ≈ 10(-5), alone provides evidence for non-baryonic DM.” (DM = dark matter; CMB = cosmic microwave background). https://lnkd.in/e6ifiQMn View in LinkedIn

The Little Prince in his common state, relaxing. View in LinkedIn

Refracted entry portal of the old town Girona, Spain. View in LinkedIn

ULTRAVIOLET BLOCKER. “In the steady atmospheric state of the present-day era, the intensity of UV light reaching the Earth's surface is attenuated by ozone. However, the UVB-absorbing power of SO2 is 2·5 times greater than that of ozone.” https://lnkd.in/e5hTuW74 View in LinkedIn

The determination of hope over experience. View in LinkedIn

“PLATO concludes that the body is composed of the same elements as the universe, and that, finally, the universe is ruled by mind.” (Page 104). https://lnkd.in/eq8pQ57b View in LinkedIn

SULFUR DIOXIDE ANOMALY. “One biologically significant property of stratospheric SO2 is that it strongly absorbs solar UV light in the UVB wavelength range of 290 to 320 nm.” https://lnkd.in/e5hTuW74 View in LinkedIn

SULFATE STORY. “One estimate is that 326–527 gigatonnes of SO2 were distributed globally in the stratosphere. Another, in broad agreement, put the quantity of stratospheric SO2 in the range of 200–400 gigatonnes.” https://lnkd.in/e5hTuW74 View in LinkedIn