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  The NASA’s Chandra X-ray Observatory has shared images of two super massive black holes merging. These black holes are located in Galaxy NGC 6240. They are 3,000 light-years apart and will drift together to form a larger black hole millions of years from now.   The merging process, which began some 30 million years ago, may be the most powerful sources of gravitational waves in the Universe.     Chandra X-ray Observatory It is a telescope designed to detect X-ray emissions from very hot regions of the universe such as exploded stars, clusters of galaxies, and matter around black holes. Orbiting at 139,000 km in space, the telescope was launched aboard the Space Shuttle Columbia during STS-93 by NASA in 1999.    

  WORLD HERITAGE CITY : World Heritage is the designation for places on Earth that are of outstanding universal value to humanity and as such, have been inscribed on the World Heritage List to be protected for future generations to appreciate and enjoy.         Gwalior and Orchha of Madhya Pradesh have been included in the list of World Heritage City by UNESCO.   Orchha, located in the Bundelkhand region of Madhya Pradesh, was the 16th century capital of the erstwhile Bundela dynasty It is famous for its temples and palaces for a unique confluence of Rajput and Mughal architectural influences   Gwalior city has been the capital of Gurjar Pratihar, Tomar, Baghel Kachhwahs and Scindia Rajvansh.   The ancient signs left by them will be found in the form of monuments, forts, palaces.   After being included in the list of World Heritage, UNESCO will work with the tourism department of the state to preserve and refine these archaeologicalm...