World Topics 313

Have you ever looked up at the night sky and wondered why scientists only observe the universe from observatories built in specific areas on Earth?  With the help of ground-based telescopes, we have discovered the secrets of  black holes ,  galaxies , and  objects billions of light years away . But observing the sky from every location on Earth is not the same. Let's find out what natural conditions are considered the best for an observatory, and which places on Earth are home to the world's greatest observatories. Recently, the first astronomical images were published from the world's largest digital camera (LSST), which is installed at an observatory at an altitude of 5,200 feet on a mountain in Chile. No matter how modern a telescope is, it can only give the best results when the sky is clear.   Earth's atmosphere scatters, bends, or absorbs the light from these stars and galaxies. That's why scientists choose locations where the weather and geographical...

  .🌑 Callisto is a moon of Jupiter that is considered one of the oldest and most cratered bodies in the solar system ? A mysterious and silent moon, which holds the secrets of time wrapped in the form of craters on its body. .🪨 History buried in silence Callisto's surface bears the marks of millions of meteorite impacts , indicating that the moon has existed unchanged for billions of years. Its surface is made up of ice and rocky material, making it a desolate but attractive world. 🔬 In the light of science Astronomers believe that Callisto may also have a subsurface ocean beneath its surface , although the chances of life here are not as high as on Europa or Ganymede . Nevertheless, it holds information that could help us understand the origins of the solar system . 📜 Historical background Callisto was discovered by Galileo in 1610 . It is named after the Greek mythological character “Callisto,” who was a lover of Zeus (Jupiter). This reflection of ancient stories has now bec...

The bomb dropped on Hiroshima exploded at 8:10 a.m. on August 6, 1945, at an altitude of about 1,800 feet above the ground. The effects of the radiation are still visible 79 years later. On that Monday morning, human bodies were scorched, flesh peeled off bones, people were walking around with their eyes closed, watching their wives, children, or parents burned in the flames under the rubble before their eyes. The destruction of the bomb, the monster of fire, and the strong wind seemed to have consumed not only the body but also the soul. The desire for peace turned into fear and floated in their eyes. The name of the plane with the first bomb dropped on Hiroshima was the Enola Gay. The pilot named it after his mother. A burnt lunch box and a burnt uniform of a girl are still kept in the Peace Memorial today. Ironically, the person who gave her child that lunch and sent her to school in that uniform was also a mother. The discovery of nuclear fission in 1938 quickly spread throughou...

The United States  is the first country in the world to have built an atomic bomb . It is also the only country to have used one. It tested the first atomic bomb on  July 16, 1945.  The United States has 5,550 atomic bombs and has deployed 1,700 atomic bombs in various locations. Russia  : The second country to develop an atomic bomb is the Soviet Union . Russia tested its first atomic bomb on August 29, 1949 . Russia has 6,257 atomic bombs, more than the United States. Russia has 1,600 atomic bombs deployed at various locations. Britain  : The third country to produce an atomic bomb was Britain. It tested an atomic bomb for the first time on October 3, 1952 . Britain has 225 atomic bombs, and has installed 120 atomic bombs. France  : France is the fourth country to have developed an atomic bomb. It tested its first atomic bomb on February 13, 1960 . It has 290 atomic bombs. It has deployed 280 atomic bombs. Israel  : It is difficult to say that Israel...

The first thing you should do is control your heart. Panic is the first door to death. A person who is nervous cannot think. And he who cannot think cannot escape. So keep your heart strong.  The first thing to do is as soon as you know that a nuclear explosion has occurred or is about to occur. Drop everything and lie down on the ground. Never see the light. This light can burn your eyes even if you are far from the explosion. Turn your face to the other side. Put your hands over your eyes. If you have a sheet or cloth, cover your face with it. Then the second thing to do immediately is A strong wind wave will come a few moments after the explosion, it can knock everything down, so you have to immediately hide behind a strong wall or a ditch. You have to lie down on the ground and cover your head with your hands or a bag or something. This will take ten seconds. If you stand still, you will get hurt. If you are inside a building, move away from windows immediately. Glass can break...

Even when you're sitting perfectly still, you're moving through the universe at mind-bending speeds. As Earth orbits the Sun at an average velocity of 18.82 miles per second (30.29 km/s), you travel roughly 186 miles (300 kilometers) every 10 seconds without lifting a finger. Even at its slowest, Earth still carries you faster than any human-made spacecraft ever launched. But Earth's motion is just one part of a much larger journey. Our entire solar system is orbiting the center of the Milky Way galaxy , pulled along by the Sun at an astonishing speed of 124 miles per second (200 km/s). That means you’ve already traveled another 1,243 miles (2,000 km) through the galaxy all in the blink of an eye. And that journey continues, as the Milky Way itself races through space at 373 miles per second (600 km/s), adding an additional 3,728 miles (6,000 km) to your cosmic commute . These combined motions planetary, galactic, and universal highlight just how dynamic our place in the ...