A Short Introduction To Space

Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. (Wikipedia) The concept of space is considered to be of fundamental importance to an understanding of the physical universe. The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. Before the birth of the Universe, time, space and matter did not exist. ... The space between the stars and galaxies is largely empty.The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. Before the birth of the Universe, time, space and matter did not exist.

The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter. Space is also filled with radiation (e.g. light and heat), magnetic fields and high energy particles (e.g. cosmic rays).

The Universe is incredibly huge. It would take a modern jet fighter more than a million years to reach the nearest star to the Sun. Travelling at the speed of light (300,000 km per second), it would take 100,000 years to cross our Milky Way galaxy alone.

No one knows the exact size of the Universe, because we cannot see the edge – if there is one. All we do know is that the visible Universe is at least 93 billion light years across. (A light year is the distance light travels in one year – about 9 trillion km.)

The Universe has not always been the same size. Scientists believe it began in a Big Bang, which took place nearly 14 billion years ago. Since then, the Universe has been expanding outward at very high speed. So the area of space we now see is billions of times bigger than it was when the Universe was very young. The galaxies are also moving further apart as the space between them expands. 

• How old is space?

13.8 billion years

This information helps astronomers determine the age of the universe. Age may only be a number, but when it comes to the age of the universe, it's a pretty important one. According to research, the universe is approximately 13.8 billion years old.

• What is a galaxy?

We live on a planet called Earth that is part of our solar system. But where is our solar system? It's a small part of the Milky Way Galaxy.

And our galaxy is just one of millions and millions. Find out more about what a galaxy is and how many there are.

• Why is space silent?

Space Environment

So, in order for sound to travel, there has to be something with molecules for it to travel through. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there are no molecules to vibrate. There is no sound there.

• What does space smell like?

When astronauts return from space walks and remove their helmets, they are welcomed back with a peculiar smell. An odor that is distinct and weird: something, astronauts have described it, like "seared steak." And also: "hot metal." ... Add to that the fact that ethyl format itself smells like rum.

Now see some scariest things in the space :

• These Scary Things in Space Will Haunt Your Dreams:

1. Ghost Hand of God. NASA/JPL-Caltech/McGill. ...
2. Screaming Skull. A. ...
3. Space Ghosts. Adam Block, NOAO, AURA, NSF. ...
4. Halloween Skull in Space. NAIC-Arecibo/NSF. ...
5. Zombie Pac-Man Nebula. Gemini South GMOS/Travis Rector/U. ...
6. Eye of Sauron is Watching You. NASA, ESA, P. ...
7. The Face on Mars. NASA. ...
8. Ghost Head Nebula

• How cold is space?

As you probably know, space is already very, very cold — roughly 2.7 Kelvin (-270.45 Celsius, -454.81 Fahrenheit). This is mostly due to a lack of atmosphere and the vacuum-like nature of space — with very few molecules to energetically bounce around, there can be no heat.

• Why is space cold?

The reason outer space is so cold is because cold is what you get when there is no source of heat nearby. At our distance from the sun, if you put, say, a Mac Truck in space, the side facing the sun will quickly get hot enough to burn you.

• Space is not empty 

Now came to the point space. I say five letter or one word that space is ‘everything’. So in simple language space is what. If we delete all planets, stars, solar systems,  galaxies universes, multiverses, and also atoms and people and alien from our entire everything and also you, so which you can see is called space. But space is not empty really not empty. Now take an example. Take two magnets and try to touch the South Pole- South pole or north pole - North Pole. You can see it is impossible to attach them without any force from outside. So between the north north pole or South south pole there is  something which causes this problem. So there is a space, so there is something which is working on there. So the space is not empty. Now take another example. You take a new mobile phone with 16GB internal storage. Now download many games, movies, Pdf. After that you can see your storage is now full of many games for movies or other things. So think that you have only 3 GB storage in your mobile phone now. Then reset or delete everything from your phone. You can  see you cannot get back 16GB storage because the own apps of phone get space to stay, but you are unable to delete them so the space is not fully empty. Now compare it with the whole space. After deleting everything of the space the space do not become empty. Quantum mechanics say same…. space is not empty space is full of matter not empty.