Posts Tagged ‘ Black Hole ’

Journey to the Edge of the Universe?

Journey to the edge of the universe.

Few things I would like to share about the Universe with all of you. So, here I go:

  • We all heard about Big Bang theory but ever you wonder where did the Big Bang happen? Well! Answer to this question is, it occurred everywhere in the Space.
  • There is a common assumption that the Big Bang was an explosion that occurred in an empty space and then that explosion expanded into the empty space. This assumption is wrong; Big Bang theory isn’t about explosion in the space. Space and time were created in the Big Bang. According to the Big Bang theory, at the beginning of the universe, the space was completely filled with matter. The matter was originally extremely hot and very dense and then expanded and cooled to eventually produce the stars and galaxies we see in the universe today. Although space may have been concentrated into a single point at the Big Bang, it is equally possible that space was infinite at the Big Bang. In both scenarios the space was completely filled with matter which began to expand.
  • The Universe is probably about 14 billion years old, but the estimations vary. One problem with working out the age of the Universe is that there are stars in our galaxy which are thought to be older than 14 billion years; older than the estimated age of the Universe. So, either the stars must be younger, or the Universe older.
  • We can’t say anything about what existed before Big Bang. Some theories suggest that our universe is part of an infinity of universes called a multiverse which are being continuously created. This is possible but very hard to prove.
  • The universe we live in is expanding continuously. We know this because we see galaxies and groups of galaxies steadily moving apart in the universe. This expansion has been occurring since the universe was formed billions of years ago in a very hot, dense event that is known as Big Bang. The universe is expanding faster than the speed of light. Although at any local point within the universe, nothing can travel faster than the speed of light, this is not true for the entire universe. There is no limit on how fast space can expand and there is no center of the expansion, the universe is simply expanding at all points. Observers in any galaxy see most of the other galaxies in the universe moving away from them.
  • We named our galaxy as Milky Way and our galaxy, the galaxy we live in is one among the billions in space and it contains billions of stars. Now you can imagine how giant is the Universe!
  • There may be a huge black hole in the very middle of the most of the galaxies. It is known as super-massive black hole. It is believed that possibly all galaxies, including the Milky Way, contain super-massive black holes at their centers. And it is also believed that if you fell into a black hole, you would stretch like spaghetti. There are white holes too which spray out matter and light like fountains.
  • The Universe may neither  has a center nor an edge, because according to Einstein’s theory of relativity, gravity bends all of space-time around into an endless curve.
  • Just for a fact, light travels at exactly 299,792,458 meters per second in a vacuum (about 300,000 kilometers per second or just over 1 billion kilometers per hour). As a comparison, sound waves travel at a paltry 343.14 meters per second (about 1,235 kilometers per hour), almost a million times slower than light waves, a day in Mercury lasts approximately as long as 59 days on earth and the red color of Mars comes from the rusted iron in its soil.
  • Ever wonder how can we calculate the force of gravity between two celestial bodies? We all can calculate it if we know the masses and the distance between the celestial bodies. Just multiply their masses together and then divide the total by the square of the distance between them. It’s a Newton’s law!