11 fevereiro 2018

Blue Comet Meets Blue Stars


What's that heading for the Pleiades star cluster? It appears to be Comet C/2016 R2 (PanSTARRS), but here, appearances are deceiving. On the right and far in the background, the famous Pleiades star cluster is dominated by blue light from massive young stars. On the left and visiting the inner Solar System is Comet PanSTARRS, a tumbling block of ice from the outer Solar System that currently sports a long ion tail dominated by blue light from an unusually high abundance of ionized carbon monoxide. Comet PanSTARRS is actually moving toward the top of the image, and its ion tail points away from the Sun but is affected by a complex solar wind of particles streaming out from the Sun. Visible through a small telescope, the comet is fading as it recedes from the Earth, even though it reaches its closest point to the Sun in early May.

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The First Lady Who Wished To A Be Queen

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The Sassanian Empire's Claim To Fame

Who were the successors to the Roman’s archrivals, the Parthians? You probably guessed from the title – the Sassanians. It is widely considered the last “true” Persian Empire. Why?

Answer

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Columbus was Obsessed with Jerusalem

Christopher Columbus was interested in reaching Asia, and believed he had, as we all know. But did you know that his original reason for wanting to open a new trade route to the rich East was to pay for a military campaign to capture Jerusalem? Never mind that the holy city had been in Muslim hands 1187 – some good 300 years by Columbus’ time.

Once the New World was reached, Columbus kept his eye on the prize, like any good Catholic. He reported that there was so much treasure in this “Asia” he had found, that within seven years the Spanish crown could raise enough money for 5,000 cavalry and 50,000 footsoldiers, and use them to conquer Jerusalem. Sadly for Columbus’ lofty religious visions, the Spanish crown was uninterested in conquering Jerusalem, which is on the wrong side of the Mediterranean from Spain.

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A Partial Eclipse Over Manila Bay


What's happened to the setting Sun? An eclipse! In early 2009, the Moon eclipsed part of the Sun as visible from parts of Africa, Australia, and Asia. In particular the featured image, taken from the Mall of Asia seawall, caught a partially eclipsed Sun setting over Manila Bay in the Philippines. Piers are visible in silhouette in the foreground. Eclipse chasers and well placed sky enthusiasts captured many other interesting and artistic images of the year's only annular solar eclipse, including movies, eclipse shadow arrays, and rings of fire. On Thursday parts of the Sun again will become briefly blocked by the Moon, again visible to some as a partial eclipse of the Sun. Thursday's eclipse, however, will only be visible from parts of southern South America and Antarctica.

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