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Ankita Singh 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
The Tethys Ocean, also called the Tethys Sea or the Neotethys, was an ocean during much of the Mesozoic Era located between the ancient continents of Gondwana and Laurasia, before the opening of the Indian and Atlantic oceans during the Cretaceous Period.
Posted by Manoj Kumar Gupta 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
The Aurora borealis is an incredible light
show which caused by collisions between electrically charged particles released
from the sun, that enter the earth’s atmosphere and collide with gases such as
oxygen and nitrogen present in the atmosphere. These lights are seen around the
magnetic poles of the northern and southern hemispheres.
Auroras
that occur in the northern hemisphere are called ‘Aurora Borealis’ or ‘northern
lights’ and auroras that occur in the southern hemisphere are called
‘Aurora Australis’ or ‘southern lights’.
Both these Aurora’s can be seen in the northern or southern hemisphere, in an irregularly shaped like oval centered over each magnetic pole. Aurora displays can appear in many different colours, although green is the most common, but in addition to this, colours such as red, yellow, green, blue and violet are also seen occasionally. The auroras can appear in many forms, from small patches of light that appear out of nowhere to streamers, arcs, rippling curtains or shooting rays that light up the sky with an incredible glow.
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Yogita Ingle 5 years, 7 months ago
Black holes are one of the most mysterious and powerful forces in the universe. A black hole is where gravity has become so strong that nothing around it can escape, not even light. The mass of a black hole is so compact, or dense, that the force of gravity is too strong for even light to escape.
Black holes are truly invisible. We can't actually see black holes because they don't reflect light. Scientists know they exist by observing light and objects around black holes. Strange things happen around black holes to do with quantum physics and space time. This makes them a popular subject of science fiction stories even though they are very real.
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Nags Raj 4 years, 10 months ago
1Thank You