A tribute to a great African-American planetary scientist

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Meet Claudia Alexander, NASA Badass Who Never Got Her Due

In a field dominated by white men, Claudia Alexander was a pioneer

For The Daily Beast:

Comet 67P/Churyumov—Gerasimenko is a tiny world of ice and rock, just 5 kilometers long. The comet is shaped vaguely like a rubber duck, with steep cliffs and other prominent features that stand much taller in relation to the size of the world. One of remarkable features is a twin set of sharp “horns” on the head of the rubber duck, known now as C. Alexander Gate.

Claudia Alexander served as project scientist for the Rosetta mission, which is orbiting Comet 67P. Until her death in July, she helped lead the United States side of the project, coordinating the various scientific and engineering aspects of the mission. Last week, her colleagues named the C. Alexander Gate in her honor and memory, with her European Space Agency counterpart Matt Taylor making the announcement.

Alexander is the first, and so far only, African-American woman to achieve such a prestigious position on a space mission, and she did it twice: once for the Galileo spacecraft to Jupiter and again for the Rosetta probe to Comet 67P. In fact, she was also the youngest ever appointed when she was picked at age 40 to be the final project scientist for the Galileo mission in 2000. [Read the rest at The Daily Beast….]

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Are comets the origin of Earth’s oceans?

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Are comets the origin of Earth’s oceans?

From The Daily Beast:

Water, water everywhere, but where did it come from? One common explanation is that the water in Earth’s oceans was brought by comets, which bombarded the planet during its earliest period. It’s a simple, logical, and testable story.

But that doesn’t mean it’s right. A new study published last week in Science revealed that the water on Comet 67P/Churyumov-Gerasimenko doesn’t match that found on Earth. Specifically, instruments aboard the Rosetta probe measured the relative amount of deuterium in the comet’s water and found it was roughly three times higher than the amount in Earth’s oceans. Comets are chemically pristine, mostly unchanged over the Solar System’s 4.5 billion year history, so a mismatch in the deuterium content complicates the story of Earth’s water. [Read more at The Daily Beast….]