क्या ब्रह्मांड का विस्तार बाह्य अंतरिक्ष को निर्वात बना देता है?
बाह्य अंतरिक्ष का निर्वात ब्रह्मांड के विस्तार के कारण नहीं है, लेकिन गुरुत्वाकर्षण के कारण होता है. सबसे पहले, जब हम कहते हैं बाहरी स्थान (ग्रहों और तारों के वातावरण के बाहर का स्थान) एक है “खालीपन” or is “empty”, we really mean that outer space is लगभग empty or almost a perfect vacuum. वास्तव में, even the most remote spot of outer space has gas, धूल, विकिरण, गुरुत्वाकर्षण, and a whole host of other things. There is no such thing as truly empty space. If we tried to suck all the particles out of a certain volume, we could still never get it empty. There would still be things like vacuum fluctuations, गुरुत्वाकर्षण, and dark matter, which can’t be sucked out. उस के साथ कहा, outer space is very close to empty compared to earth’s atmosphere. आप अभी भी आधे घर में नहीं हैं?
Every particle of matter, no matter how small, exerts a gravitational attraction on all other particles of matter. For small bits of matter like a hydrogen atom and for large distances like we see on the astronomical scale, the force of gravity is very weak. But it is not zero. Given enough time, gravity makes giant clouds of gas in space condense down despite the gravitational force being so weak. Soon after the Big Bang, the universe was filled with a nearly uniform soup of hydrogen and helium. Over billions of years, gravity pulled most of these gas atoms into stars. Inside the nuclear furnace of stars, hydrogen and helium were fused to form the heavier elements up to iron. Larger stars eventually died in an explosive supernova which created all the naturally occurring elements heavier than iron and spewed these heavier elements into space. अधिक समय तक, these heavier elements condensed down under gravity to form small clouds and rocks. के बदले में, the clouds and rocks gravitationally attracted each other to form asteroids, moons, and planets. Outer space is nearly empty because most of matter that used to be out there has literally fallen into an asteroid, planet, moon, or star under the influence of gravity.
The expansion of the universe only affects the distance between galaxies, and does नहीं increase the distances between objects inside a galaxy. Atoms in your body, creatures on earth, planets in a solar system, and solar systems in a galaxy are all far too strongly bound by gravity and electromagnetism to be affected by the expansion of the universe. नतीजतन, the expansion of the universe cannot explain the relative emptiness of the space inside a galaxy.
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आपको चाहिए लॉग इन करें या रजिस्टर करें एक नया उत्तर जोड़ने के लिए.