Better constants in science

More precise constants in science.

The numbers include reduced uncertainties for several key constants, which physicists say is encouraging because these will allow for better tests of theory. The more precise figures will also aid plans to redefine familiar units of measureยญment, such as the kelvin and the kilogram, in terms of unchanging fundamental constants rather than relying on a material object that might not be stable (as for the kilogram standard).

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Downgrade could come as soon as Friday

The day of reckoning looms even closer: Credit rating downgrade for the U.S. government could come as soon as Friday. Key quote:

Itโ€™s not the debt ceiling thatโ€™s triggering a potential ratings change โ€” itโ€™s the trajectory of debt generated by the federal government.

And this:

The problem, as [the ratings agencies] see it, is not that America canโ€™t pay its debts next month, but that America has grown its debt to such a degree that we canโ€™t pay them in the long run without serious restructuring of the federal government โ€” and this administration refuses to consider it:

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Conservatives bridle at trillions in ‘phony’ cuts

Trillions in “phony” cuts?

The devil is in the details,” says a Republican strategist closely involved in the debt fight. “When you’re talking about $1 trillion [over ten years], you’re talking about $100 billion a year, but it doesn’t necessarily have to be evenly distributed among the years.” Does that mean it might be loaded mostly at the end of the decade, when it might not even happen? “That’s where you get into the details,” the strategist says.

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Enceladus rains water onto Saturn

The Herschel space telescope has discovered that the water expelled from the tiger stripes on Enceladus eventually rains down on Saturn.

Enceladus expels around 250 kg of water vapour every second, through a collection of jets from the south polar region known as the Tiger Stripes because of their distinctive surface markings. These crucial observations reveal that the water creates a doughnut-shaped torus of vapour surrounding the ringed planet. The total width of the torus is more than 10 times the radius of Saturn, yet it is only about one Saturn radius thick. Enceladus orbits the planet at a distance of about four Saturn radii, replenishing the torus with its jets of water.

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