Questions & Answers Related to The Universe
The Vast Universe
How Did The Universe Originate
The universe is so weird how the Earth's ocean ans the universe have similarities. This reminds me of a magnified pic of beach sand... seems so small from far away, but get closer and there is something you never knew was there or what it was.
How did the universe Originate?
Ans Man has always wondered how the universe originated. There are a lot of theories which explain its origin.
Big Bang Theory,"The universe is the result of an explosion." This explosion occurred about 14 billion years ago.When Big Bang occurred it released a lot of energy. This energy keep the universe expanding. This expansion is likely to continue for another 50 billion years.
Some other scientists says that the space has no beginning or end.
Q What does the universe consist of?
Ans The universe is so vast that it contains every thing. It consist of all the Galaxies,the stars,the sun,the earth and every thing that exist in this limitless space. The size of space is beyond the human imagination. It is impossible to describe the universe exactly,because no one knows what it actually consist of.
It is the imagination that there may be a number of worlds in the space about which we know nothing. Even every empty space is the part of the universe, and so are matter,time and energy. It is impossible to imagine the nature and vastness of the universe.
What We Understand About The Birth of The Universe by Big Bang Theory
The vast universe was once smaller them an atom. This tightly packed particle exploded and form it came all the material of which the universe made.
After the explosion, the universe start expanding and it is expanding till now and it will keep expanding in the future. The space and time are expanding with an incredible rate. This phenomenon is known as the inflation of the space. At the end of the rapid inflation, the universe become cooler , and the particles that up matter began to form out of some energy.
The gas and dust formed after the explosion, condensed into galaxies, that are speeding away from each other.
The Steady State Theory
Although most of the scientists agree that the universe began with Big Bang theory,There were some others who were against this theory.They follow The Steady State Theory.
According to this theory,"The universe is uniform throughout both time and space and have no beginning. Since this theory had no answer to many phenomena found in the universe, It gradually lost its supporters.
Light Year And Black Hole
What is a Light Year ?
A light year is not a measure of time. It is a measure of distance. Stars and planets are so far away that if we measure the distance in kilometer, the number would be enormous. So,these huge distance are measured in light years. Light travels at a speed of 299792.458km per second. So a light year is the distance travelled by light in one year.
Light Year = 9,460,000,000,000km
Proxima Centauri, our nearest star, next to the sun is 4.2 light year away from us.
Q What is a Black Hole?
Ans Black holes are the region in space with strong gravitational force of a black hole is so strong that nothing can escape from it,not even light. In 1919, Albert Einstein proposed the concept of black holes as a part of his General Theory of Relativity.
Some scientists are curious to know about the space and Our Universe. The want to know about the beginning and end of the universe. Such astronomers and scientists who study about the origin and the future of the universe, are known as cosmologists.
Saguaro Blue Hour
Just after sunset, and just before sunrise, the sky can take on a deep and rich blue tone that adds dramatic color to photographs. This ‘blue hour’ between daylight and darkness has so much color and depth that is highly sought after by photographers for its incredible impact on their work.
The Galaxy And Its Birth
What is a Galaxy?
A Galaxy is a massive group of hundreds of millions of stars, all held together by gravity,orbiting around a common centre.
The Milky Way is the galaxy in which our sun,earth and planet exist.
All stars visible to the naked eye from the earth also belong to our galaxy,the milky way. our sun is just a star in the milky way.
There are billions of galaxies in the universe. Some galaxies are small having only a million of stars, while some others could have as many as 500 billion stars,or even more.
Why the Milky Way is special to us?
The milky way is the galaxy in which our sun,earth,and planet exist. The Milky Way is shaped like a huge whirlpool or spiral that rotates once every 200 million years. It is made up of at least 100 billion stars,as well as dust and gas.
It is so big that light takes 100000 years to cross from one side to the other. Scientist think that the center of the galaxy contains a super massive black hole that swallows anything passing too close. The sun and its planets,including our earth, lie in the quiet part of the milky way,about half way out from the center.
How are Galaxy Born?
Scientist believe that clumps of gas joined together to form young galaxies called protogalaxies. These protogalaxies developed in different ways. Some had huge clumps of gas at the centre , which which formed massive explosion. Many massive explosions forced the left over gas out of the galaxy. So only the stars formed from the gas remained. Protogalaxies formed in this manner become elliptical galaxies.
Sometimes a protogalaxy will contain only small clumps of gas. Since its centre will be smaller,there will be fewer massive explosions. Most of the gas is retained along with the stars that have formed, and the galaxy becomes spiral galaxy.
Irregular galaxies are probably protogalaxies in which explosions are still going on.Through there are billions of galaxies in the universe, only three of them can be seen from earth through a telescope.They appears as small patches of light.
Well maybe not brains, but the Kronberger 61 Nebula (also known as the soccer ball nebula). The host star of the nebula can be seen as the slightly bluer star in the center of the gas ball.The oxygen image is overlaid on an image taken in an emission line of hydrogen (H alpha).The nebula was discovered by an amateur astronomer, but not from direct observations, but rather from sifting through data from the Digitized Sky Survey.
Seeing as this nebula and the stars surrounding it are in our Galaxy, Hector, they can only be around several tens of thousands of light years away. Red Dwarf stars make up (by best estimates) roughly 3/4th of the stars in our galaxy, and have life spans of trillions of years. Odds are, everything in this picture is still very much "alive".