Pluto's moons wob­ble chaot­i­cally

Down to Earth - - THE FORTNIGHT -

NASA'S HUB­BLE te­le­scope has found that Pluto's moons, Nix and Hy­dra, wob­ble un­pre­dictably. "If you lived on one of Pluto's moons, you might have a hard time de­ter­min­ing when, or from which di­rec­tion, the sun will rise each day," read a re­port pub­lished by NASA. The wob­bling takes place be­cause the moons are un­der the ef­fect of a grav­i­ta­tional field that keeps shift­ing. This hap­pens be­cause of the dou­ble planet sys­tem of Pluto and Charon. "Called a dou­ble planet be­cause of their com­mon cen­tre of grav­ity, which is lo­cated in the space be­tween the two bod­ies, the chang­ing grav­i­ta­tional field makes the moons tum­ble," says the re­port.

Pope Fran­cis in the Vat­i­can en­cycli­cal on cli­mate change "Since ev­ery­thing is in­ter­re­lated, con­cern for the pro­tec­tion of na­ture is also in­com­pat­i­ble with the jus­ti­fi­ca­tion of abor­tion"

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