Year: 2015
Cross with the Sun
Rhea’s Debris Disc

Jan 7, 2015 Evidence for the dust cloud came from a gradual drop on either side of Rhea in the number of electrons detected by two of Cassini’s instruments. Scientists from the Jet Propulsion Laboratory in Pasadena, California discovered a “debris ring” surrounding Saturn’s frigid moon, Rhea. The Cassini…
Plasma in the Ice Age

Left: Bone pendant from Saint-Marcel (Argenton-Sur-Creuse, Indre, France) Right: Bone pendant from the Grotte Des Espélugues (Lourdes, Hautes-Pyrénées, France) Jan 06, 2014 Reproduced above are images of two engraved pendants made of reindeer bone, from prehistoric sites in France. Both objects are attributed to the Magdalenian culture, which subsisted in the…
Chang’e 3
WHAT IF? Asking the Dangerous Questions with Tom Wilson
Captives of Simplifying Assumptions

Jan 3, 2015 “Our choicest plans have fallen through, our airiest castles tumbled over, because of lines we neatly drew and later neatly stumbled over.” — Piet Hein GROOKS I was checking out the dynamics describing the orbit of SOHO, the sun-watching satellite oscillating around a mathematical point in…
Descartes’ Circular Reasoning

Jan 01, 2015 By what physical mechanism do planets and moons orbit around their larger hosts? Before Newton’s theory of gravity burst onto the scene, the so-called ‘vortex theory’ of the French philosopher René Descartes (1596-1650), first proposed in the 1630s, was much in vogue. Invoking experimental analogues in fluid…