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HAvE YOU HEARD OF THE NEWS? January 12, 2009

Posted by priscilaraposo in Uncategorized.
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Black holes ‘preceded galaxies’

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A cosmic chicken-and-egg question may have been solved by astronomers who now say black holes came before galaxies.

The findings were presented at a major astronomy meeting in California.

Most if not all galaxies, including our own Milky Way, are believed to have massive black holes at their cores.

It was unclear whether black holes came first, helping create galaxies by pulling matter towards them, or whether they arose in already formed galaxies.

“It looks like the black holes came first,” said Dr Chris Carilli, from the US National Radio Astronomy Observatory in Socorro, New Mexico, who took part in the study. “The evidence is piling up.”

The evidence was unveiled at the 213th American Astronomical Society meeting in Long Beach, California.

Earlier studies of nearby galaxies had revealed an intriguing link between the masses of black holes and the central “bulges” of stars and gas in galaxies.

 

 

How does the Bush presidency rate?

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I suppose the underlying question here is whether George W Bush has been one of the worst US presidents.

Many people have already made up their minds.

For them, the invasion of Iraq was enough to put Mr Bush high on the list. And that was compounded by his lack of action elsewhere – with global warming and Hurricane Katrina as examples.

Others will want to wait a bit and see what history decides. History can improve the image of a presidency.

Harry Truman is the great example. His approval rating dipped even lower than Mr Bush’s (though Mr Bush has registered a higher disapproval rating – a discrepancy due to a decline in the number of “don’t knows”).

The Truman years were full of epic events, from the dropping of the first atomic bomb, to the start of the Cold War, to the actual Korean War, to his dismissal of the popular Gen Douglas MacArthur.

The Chicago Tribune called for Truman to be impeached.

He appeared at times to be overwhelmed and he went down, but history has brought him up again and he is now generally seen as a gutsy president who took the right decisions.

Mr Bush is hoping for a similar vindication.

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