Ivan Debono

A notebook of useful things

Page 3 of 8

Musica universalis (8) – Spacetime

Ascania (2013), Spacetime

 

Bibliography

Albert Einstein (1905), Zur Elektrodynamik bewegter Körper

Henri Poincaré (1905/6), Sur la dynamique de l’électron

Hermann Minkowski (1907/8), Die Grundgleichungen für die elektromagnetischen Vorgänge in bewegten Körpern

Musica universalis (6) – Dark energy

Oliver Lieb (2014), Dark Energy

 

Bibliography

Observational evidence from supernovae for an accelerating universe and a cosmological constant

Measurements of Omega and Lambda from 42 high redshift supernovae

 

 

Musica universalis (4) – Gravitation

Alexander Popov (2012), Attractive force

 

Bibliography

Isaac Newton, Philosophiæ naturalis principia mathematica

Albert Einstein, Die Grundlage der allgemeinen Relativitätstheorie

The first photograph of the Moon…

…and the birth of astrophotography.

The earliest known photograph of the Moon was taken by John William Draper in 1839 or 1840. Draper, an Englishman by birth, was a chemistry professor at New York University at the time. This silver platinum plate of the Moon was the first of a series he shot through his telescope.

First known photograph of the moon

From this: Probably the first photograph of the moon, 1839

 

In 2013, the Hubble Space Telescope took a picture of the farthest galaxy ever discovered,  the dwarf galaxy z8_GND_5296. Since far=old (that’s 13.1 billion years old), it also holds the record for the oldest object ever photographed using visible light.

To this: A photo of the farthest galaxy ever discovered, 2013.

To this: A photo of the farthest galaxy ever discovered, 2013.

 

Size doesn’t matter

US Defense Secretary Chuck Hagel announced today the new Pentagon proposal for the future structure of the US Armed Forces. The New York Times carried an article yesterday giving an overview of the planned restructuring, which, in a nutshell, is all about downsizing. 2086099367At first glance, this might look like: less troops = less fighting power. But wars, and confrontations are not, and never where, about the number of troops. They are all about the utility of force.

The paradigm of industrial war is over. That is not to say that peace has broken out. It is just that wars are no longer a force-on-force confrontation confined in space and time. War spills over into areas outside the military domain: economic and financial power, cultural domination, cognitive warfare, demographic and political power are all means by which wars are fought, but none of them involve military force, still less force numbers.

The Armed Forces are but one weapon in the US arsenal. I don’t see any decrease in the size of the other weapons.

Such as these: IBISWorld-Top-10-Fastest-Growing-US-Industries-Apr2013

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