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Scientists found evidence that Earth's magnetic field is more than a half-billion years older than we'd thought. As usual, that raises more questions. The European Space Agency's Philae lander detected a "rich array" of organic compounds on Comet Churyumov-Gerasimenko 67P, including hydrogen cyanide (HCN). This is a big deal, since much of Earth's water came from comets: and HCN may have helped life begin on our world. More at A Catholic Citizen in America .

Humans have hands . So do apes, monkeys, lemurs, and koalas. For that matter, a chameleon's feet look and act a lot like hands. But they don't have precision-grip thumbs that can line up with any finger. We do: and apparently have had a firm grip on tools for over two million years. Scientists had a pretty good idea about how the common ancestor of dinosaurs, crocodiles and alligators, and birds, developed. A quarter-billion-year-old fossil shows that the situation is more complicated than scientists thought.... More at A Catholic Citizen in America .

Some scientists think dinosaurs could have survived that asteroid impact. Others are taking another look at big a starship needs to be, and NASA is taking bids on long-distance service to Mars.... " ...But first, a bit about the Beatitudes, Ulysses, and Dante's "Inferno."... ...Expecting knowledge, or anything else, to take God's place would be daft: and against the rules. But that doesn't make seeking knowledge bad. Studying this universe and developing new tools are part of being human. That's what we're supposed to do.... " More at A Catholic Citizen in America .

(From Peter Kennett, via Wikimedia Commons, used w/o permission.) (M31, the Great Andromeda Galaxy, one of 54 galaxies in the Local Group , photographed in 2005.) Folks can see the Andromeda Galaxy from Earth's northern hemisphere: on a clear night with no moon, anyway. Abd al-Rahman al-Sufi gets credit for 'discovering' it: but I'm pretty sure that quite a few folks had seen it before he mentioned "A Little Cloud" in " Book of Fixed Stars, " somewhere around 964. Knowledge and Change In 1764, Charles Messier, another astronomer, put the galaxy in his catalog as a nebula: object M31. By the 19th century, astronomers realized that some light from the Andromeda "nebula" resembled light from stars. In 1925, Edwin Hubble used observations of Cepheid variable stars to demonstrate that the Andromeda Galaxy was another " island universe :" far outside our Milky Way Galaxy. Light from the Andromeda Galaxy passing Earth toda...