Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

Thursday, 6 August 2026

RANT: AUGUST 6, 1945

 
YESTERDAY, AUGUST 6,
was the 81st anniversary of the atomic bombing of Hiroshima. August 9 will be the 81st anniversary of the atomic bombing of Nagasaki. Both cities received widespread destruction with total deaths estimated at around 210,000 civilians.* The Hiroshima bomb, nicknamed “Little Boy”, used Uranium-235 as its explosive core, while the Nagasaki bomb used Plutonium-239, with yields of 15 kilotons of TNT and 21 kilotons of TNT1 respectively.
  
THE PHOTOGRAPHS BELOW are of Hiroshima and Nagasaki in the days after the bombings. One should note that while the Nagasaki bomb was more powerful than the bomb dropped on Hiroshima, the damage to the city was less and the death toll lower. This is because the bomb was dropped slightly off target, whereas the earlier Hiroshima bomb was dropped on the city centre, not far from city hall, where the building’s skeletal remains at ground zero can be seen in the distance on the left bank of the Ota River. Hiroshima is on a flat river plain where there are few natural obstacles to deflect the blast and fire. The city of Nagasaki, by contrast, sits in “an amphitheater of steep coastal slopes and peaks”, which absorbed and deflected some of the 21 kT blast. Both cities were destroyed and tens of thousands died in an instant with many more succuming to injuries and radiation poisoning in the days, weeks and months after the bombs fell. 
 
HIROSHIMA

 
 
 
 
 
 
 
 
 
 
 
 
NAGASAKI

 
 
 
 
 
 
 


 
 
  
THE DRAWING BELOW is from the book Unforgettable Fire—Pictures Drawn by Atomic Bomb Survivors, published by Pantheon Books, 1977. 
 
"The girl was injured on the chest and covered with blood. She had no shoes on her feet. Still able to think clearly she avoided the many splintered things on the road and trudged towards her home where her family was waiting for her.
Passing through Matoba section, the girl and I came to the area called Kojin-machi Akebono-cho. On both sides of the road there were temples. Everywhere was a sea of fire. No road was open for us anymore except for a narrow path and that was barely passable. The clothes which we earlier had dipped in water had already dried so much that they were almost to the point of burning. There was no time to lose. We dipped our clothes in the water that was stored in an air-raid shelter and dashed through the fires desperately.
‘Awfully hot! Is this the end of my life?...Oh God!...Help me!’ I murmured and prayed.
When we managed to come to a safer place, we looked back at the path we had dashed through. It was the most frightful scene I had ever witnessed in my life. Yet even at this safer place, I found many dead bodies lying in the air-raid shelter, under fallen trees, and everywhere. When we final arrived at the girl’s home at Nakayama section, the darkness of the summer’s night was already falling upon us.”


CHEERS, JAKE. ____________________________________
 
* Figures include immediate deaths from the explosions and those later succumbing to radiation burns and radiation sickness by the end of 1945.
 
1. “TNT” stands for “trinitrotoluene”, a compound that has a chemical “punch” less than dynamite but is more stable with a longer burn rate, making it useful as a propellant in firearms, bombs and artillery shells. Dynamite’s higher shattering effect (“brisance”) and shorter burn rate is aided by the addition of nitroglycerin, a relatively unstable substance, which gives dynamite a “higher detonation velocity, a sharper shattering effect, and more chemical energy per kilogram than TNT.” Dynamite is a “high explosive” useful in mining, excavation, and blowing shit up.
TNT is used as the “benchmark” from which to gauge the relative power of various explosives including nuclear weapons. For comparison, the explosive potential of today’s nuclear weapons are orders of magnitude greater than those early bombs at the end of WWII. For example, 1 megaton=1000 kilotons=1,000,000 tons. Recall that the Hiroshima detonation was roughly 15 kilotons or 15,000 tons of TNT. Just a burp by today’s standards!
 
👉The largest nuclear weapon ever detonated was in 1961 over the Novaya Zemlya archipelago in Russia’s far north. Dropped from a high-altitude bomber, the explosion registered as 50 megatons or 50,000,000 tons of TNT. The Nagasaki bomb (“Fat Man”) yielded 21 kilotons or 21,000 tons of TNT.
 
💥DID YOU KNOW that a Plutonium-239 sister to the Nagasaki bomb, was the one they tested at the Alamogordo (nicknamed "Trinity") test site in New Mexico on July 16, 1945? The bomb's builders didn't bother testing a Uranium-235 bomb because they knew it would work with its relatively simple firing mechanism. The bomb with the Plutonium core was triggered by explosive charges surrounding it, forcing the core to implode and in doing so releasing a tremendous burst of light, heat and blast. The scientists at the Trinity test site weren't sure if it would work. But it did. And here we are.💥
 
👉WE CAN REST EASY, HOWEVER, with the assurance that modern nuclear arsenals rarely keep in stock warheads with over one or two megatons of explosive power (something about overkill, I should think). And, should anyone want to get an understanding of what it would be like to live in a city when a 1 Mt nuclear device is detonated they should read Annie Jacobsen’s Nuclear War. [A word of caution for those who like to read in bed: Be prepared or you’ll shit the sheets for sure! Ed.] 
 

 
    
 

Monday, 30 March 2026

INTERESTING STATISTICS

 
Artist Rendition of orbiting debris and functional satellites 
“Number of rockets launched since the start of the space age in 1957: About 7170 (excluding failures)
Number of satellites these rocket launches have placed into Earth orbit: About 25170
Number of these still in space: About 16910
Number of these still functioning: About 14200
Number of space objects regularly tracked by Space Surveillance Networks and maintained in their catalogue: About 44870
Estimated number of break-ups, explosions, collisions, or anomalous events resulting in fragmentation: More than 650
Total mass of all space objects in Earth orbit: More than 15800 tonnes.
NOT ALL objects are tracked and catalogued. The number of objects estimated based on statistical models to be in orbit:
54000 space objects greater than 10 cm (including approx. 9300 active payloads)
1.2 million space debris objects from greater than 1 cm to 10 cm
140 million space debris objects from greater than 1 mm to 1 cm.”
  
AND SPACEX’S CHIEF BILLIONAIRE-IN-RESIDENCE,
Elon Musk, wants to put “one million” StarLink satellites into orbit. That would certainly upgrade our current night skies populated by all those boring, slow-moving stars, with only occasional falling ones to spice things up. More glittering objects in space is just what the doctor ordered! Who needs vast, primordial regions of dark lit by unimaginably distant stars. And concerns that cascading collisions in an over-crowded sky will damage satellites that provide global communications, GPS services and a host of other, vital operations? Those worrys are over-blown aren't they? So, don't worry as the song says. Be happy.
😟1,000,000 StarLink sats? What could possibly go wrong?
 
 
CHEERS, JAKE. ____________________________________________