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What is universe?

                                 What is universe? The universe is all planets, moons, minor planets, stars, galaxies, the content of intergalactic space and all matter and energy. The  universe  is all of space and the stars, the planets, and all other forms of matter and energy in it.                                   The Universe in physical science suggests everything, everywhere, all the space. In different words, all of space, time, and their content is the universe . It includes all the galaxies, black holes, stars, planets, and moons. It additionally includes all kinds of energy and matter. The  Universe  is all we can touch, feel, sense, measure or detect. It consists of living things, planets, stars, galaxies, dust clouds, light, and even time.  Stephen Hawking                                                    Stephen Hawking (1942-2018) once said: “Look up at the stars and not down at your feet, try to be of what you see, and wonder about what
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How old is the universe?

How old is the universe? A 2013 map of the background radiation left over from the Big Bang, taken by the ESA's Planck spacecraft, captured the oldest light in the universe. This information helps astronomers determine the age of the universe. Credit: ESA and the Planck Collaboration.          Do you know how old is the universe? Some people may know a little about how old is the universe and some might not. Those little people who know might have some doubts. This information was used by astronomers to determine the age of the universe i.e. how old is the universe? Age may only be a number, but when it comes to the age of the universe, it's a pretty important one.           As per research, the universe is approximately 13.8 billion years old. We know age is just a number but when we talk about the age of the universe, it becomes hard to guess. As per the research  till now, the universe is 13.8 billion years old in approximate. But how come the scientists are a

Stars in universe greater or the sand grains in the world deserts?

Stars in the Universe?  Which Is Greater, the Number of Sand Grains in the world's deserts and beaches, Or stars in the universe?                   Here's an old question— which are there more grains of sand in the world's deserts and beaches, or stars in the Universe? American astrophysicist Carl Edward Sagan had told that there are much more and more stars in the universe than the sand grains in the world's deserts and beaches. Is he right in his claim? Can the stars in the Universe be counted?                                                                           Obviously, grains and stars can't be counted, but you can estimate. Being well-versed in all these things, Gerry Gilmore , professor of astronomy at Cambridge University, tried to calculate the number of stars in our galaxy. He said about 2 trillion stars are there in just our galaxy considering the distance, size and the light they reflect as the factors. Rather than counting