Geography · Astronomy
Which of the following is the most accurate definition of a galaxy?
- 1A massive, gravitationally bound system consisting of billions of stars, interstellar gas, dust, and dark matter✓
- 2A cloud of gas and dust where new stars are continuously born
- 3A ring of icy debris located at the outer edges of a planetary system
- 4A localized cluster of planets and asteroids orbiting a single star
Correct answer
A massive, gravitationally bound system consisting of billions of stars, interstellar gas, dust, and dark matter
Explanation
स्पष्टीकरण:
मंदाकिनी (गैलेक्सी) की सबसे सटीक परिभाषा यह है कि यह अरबों तारों, अंतरतारकीय गैस, धूल और डार्क मैटर का एक विशाल, गुरुत्वाकर्षण से बंधा निकाय है।
मुख्य बिंदु:
घटक: इसमें केवल तारे ही शामिल नहीं होते, बल्कि गैस के बादल, धूल कण और अदृश्य डार्क मैटर का संयोजन होता है।
गुरुत्वाकर्षण बंधन: ये सभी घटक आपसी गुरुत्वाकर्षण बल के कारण एक संगठित प्रणाली के रूप में ब्रह्मांड में तैरते हैं।
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