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<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8619641663381907"      crossorigin="anonymous"></script>   सौरमंडल  हमारा सौरमंडल मंदाकिनी आकाशगंगा मे स्थित है। अरूण और वरुण दो ग्रह सहोदर भाई के नाम से प्रसिद्ध हैं। उत्तरी ध्रुव 21 जून से 22 सितंबर तक हमेशा प्रकाश में रहता है । एक ग्रह की अपने कक्ष में सूर्य से अधिकतम दूरी को अपसौर तथा न्यूनतम दूरी को उपसौर कहा जाता है । 22 दिसंबर को दक्षिणी गोलार्द्ध में सबसे बड़ा दिन होता है।  

<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8619641663381907"      crossorigin="anonymous"></script> PRE-HISTORIC PERIOD :- Paleolithic Period: - Homo sapiens first appeared towards the end of this phase. In this period, man barely managed to gather his food and subsisted on hunting. Quartzite is the first stone made tools of this phase.  Paleolithic Period is divided into 3 main phases. They are told as following:- 1. Lower Paleolithic Period  2. Middle Paleolithic Period 3. Upper Paleolithic  Period  Mesolithic Period :- This period tells about Domestication of Animals was started some characteristic tools were used that time, called as " microliths ". Bhimbetka in Madhya Pradesh, is known for ancient caves depicting pictures of birds 🐦, animals and humans. Neolithic Period:-  Neolithic people knew about fire 🔥 and  wheel 🛞 . An important site of this period is ' Burzahom'...