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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 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.

 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 makes the Universe exist. Be curious.”


        Professor Hawking was a British theoretical scientist, cosmologist, author, and director of research at the Centre for Theoretical Cosmology. In 2016, Prof. Hawking advised that black holes could be portals to different universes, maybe black holes aren't ‘eternal prisons’ from t…
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How old is the universe?

How old is the universe?
         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 able to determine the age of the universe? The universe must be older than the oldest thing that exists in the universe itself. By studying the oldest objects in the universe and measuring how fast the universe is expanding, we can guesstimate the age of the universe. Thus to measur…

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 the stars one by one, count all the galaxies in one small region of the universe close to the Earth. By…