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sun

  The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light and infrared radiation. It is by far the most important source of energy for life on Earth. Compared with the billions of other stars in the universe, the  sun  is unremarkable. But for Earth and the other planets that revolve around it, the  sun  is a powerful center of attention. It holds the solar system together; provides life-giving light, heat, and energy to Earth; and generates space weather.
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The theory of relativity

 by 'britannica' (www.britannica.com) relativity , wide-ranging physical theories formed by the German-born physicist  Albert Einstein . With his theories of  special relativity  (1905) and  general relativity  (1915), Einstein overthrew many assumptions  underlying  earlier physical theories, redefining in the process the fundamental concepts of  space ,  time ,  matter ,  energy , and  gravity . Along with  quantum mechanics , relativity is central to modern  physics . In particular, relativity provides the basis for understanding cosmic processes and the geometry of the  universe  itself. (Read Einstein’s 1926 Britannica essay on space-time.) Explaining E = mc 2 See all videos for this article “Special relativity” is limited to objects that are moving with respect to inertial frames of reference—i.e, in a state of  uniform motion  with respect to one another such that an observer cannot, by...
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friendship

 A true friend is a friend when is convenient and when it is not. They standby you consistently both when you are present and when you are not. They're Authentic and Honest with You. True friends aren't phony with you. They show you who they really are.A good friend knows all your best stories, but a best friend has lived them with you." “Many people will walk in and out of your life, but only true friends leave footprints in your heart.” “There's nothing like a really loyal, dependable, good friend. ... "My best friend is the one who brings out the best in me."They’ve been there for you through the good times, the rough moments, and everything in between. They pick you up when you’re feeling down and lift you up even higher when you’re on top of the world. They’re the first person to like and comment on your summer Instagram captions or send you a birthday quote for best friends, and these best friend quotes will remind you just how special your bond truly i...
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