Month: September 2022

SEARCH FOR STRUCTURE. “The density distribution of the SHM is formally infinite and hence the velocity distribution extends to infinity too. In reality the Milky Way halo is finite, and particles with speeds greater than the escape speed…will not be gravitationally bound to the MW.” (SHM = The standard halo model; MW = Milky Way). https://lnkd.in/e6ifiQMn View in LinkedIn

EMERGENT GRAVITY. “We see flocks of birds and schools of fish undertake coherent motion in groups, but they are really made up of individual animals. We say that the group behavior is emergent. It may be that something that arises out of the pixelation of spacetime has just been given the name gravity because we don’t yet understand what the guts of spacetime are.” https://lnkd.in/eAGRJ6Qh View in LinkedIn

The Little Prince in his common state, relaxing. 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

MONSTER CRATER. “The Bouguer gravity anomaly shows a large well-defined semi-circular concentric anomaly pattern with amplitudes up to 30 mGals with a 40 km diameter central high and two lows at about 70 km and 120 km diameters (Figure 2). Semi- circular concentric anomalies were inferred at 52.5±5km,77.1±6.3 km, 99.6±6 km and 139 ± 11 km radial distance, which define a multi-ring structure with central peak ring limited by ring 1.” https://lnkd.in/eqAYpQg2 View in LinkedIn

UNSOLVED QUESTIONS. However, paleontologists have rarely considered the biological or metabolic impact of a meteor and exactly how the dinosaurs might have died, especially those distant from a physical cause of death such as a tsunami. Most theories assume that the dust cloud caused plants to die off and reduce the dinosaur food sources. https://lnkd.in/e5hTuW74 View in LinkedIn

NUTRITIONAL DEATH HYPOTHESIS. “Why did the dinosaurs become extinct? Could cholecalciferol (vitamin D3) deficiency be the answer? (2019), by D. R. Fraser PhD, of the Sydney School of Veterinary Science, Australia. He took his PhD at Cambridge where he worked for nearly a decade in the MRC Dunn Nutritional labs, and presents a very interesting nutritional theory. https://lnkd.in/exW_KUxm View in LinkedIn

IRIDIUM FINGERPRINT. “The case for a catastrophic cause of mass extinction was strengthened by the discovery of a worldwide enrichment of the rare element iridium in a narrow band of geological strata formed 66 Mya.” https://lnkd.in/e5hTuW74 View in LinkedIn

THE LINK. “The source of that iridium was proposed to be from a huge asteroid or comet that collided with the Earth, coinciding with the time of the mass extinctions.” https://lnkd.in/e5hTuW74 View in LinkedIn

COINCIDENT IN TIME. “The discovery of the Chicxulub impact crater in the Yucatan Peninsula on the Gulf of Mexico confirmed, from its size and structure, that a large celestial object had collided with the Earth at the time that the mass extinctions had occurred.” https://lnkd.in/e5hTuW74 View in LinkedIn