Masters Of War

Come you masters of war You that build all the guns You that build the death planes You that build all the bombs You that hide behind walls You that hide behind desks I just want you to know I can see through your masks. You that never done nothin' But build to destroy You play with my world Like it's your little toy You put a gun in my hand And you hide from my eyes And you turn and run farther When the fast bullets fly. Like Judas of old You lie and deceive A world war can be won You want me to believe But I see through your eyes And I see through your brain Like I see through the water That runs down my drain. You fasten all the triggers For the others to fire Then you set back and watch When the death count gets higher You hide in your mansion' As young people's blood Flows out of their bodies And is buried in the mud. You've thrown the worst fear That can ever be hurled Fear to bring children Into the world For threatening my baby Unborn and unnamed You ain't worth the blood That runs in your veins. How much do I know To talk out of turn You might say that I'm young You might say I'm unlearned But there's one thing I know Though I'm younger than you That even Jesus would never Forgive what you do. Let me ask you one question Is your money that good Will it buy you forgiveness Do you think that it could I think you will find When your death takes its toll All the money you made Will never buy back your soul. And I hope that you die And your death'll come soon I will follow your casket In the pale afternoon And I'll watch while you're lowered Down to your deathbed And I'll stand over your grave 'Til I'm sure that you're dead.------- Bob Dylan 1963

Friday, May 3, 2013

A Spectacular Interstellar Cloud


The Danish 1.54-metre telescope located at ESO’s La Silla Observatory in Chile has captured a striking image of NGC 6559, a cloud of gas and dust located at a distance of about 5000 light-years from Earth, showcasing the anarchy that reigns when stars form inside an interstellar cloud. The glowing region is a relatively small object, just a few light-years across, in contrast to the one hundred light-years and more spanned by its famous neighbor, the Lagoon Nebula (Messier 8, eso0936). Although it is usually overlooked in favor of its distinguished companion, NGC 6559 has the leading role in this new picture.
The gas in the clouds of NGC 6559, mainly hydrogen, is the raw material for star formation. When a region inside this nebula gathers enough matter, it starts to collapse under its own gravity. The center of the cloud grows ever denser and hotter, until thermonuclear fusion begins and a star is born. The hydrogen atoms combine to form helium atoms, releasing energy that makes the star shine.
These brilliant hot young stars born out of the cloud energize the hydrogen gas still present around them in the nebula. The gas then re-emits this energy, producing the glowing threadlike red cloud seen near the center of the image known as an emission nebula. These young stars are usually of spectral type O and B, with temperatures between 10 000 and 60 000 K, which radiate huge amounts of high energy ultraviolet light that ionises the hydrogen atoms.

1 comment:

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