Big Bang

The universe contains everything that exists: Earth, the Sun, the stars, galaxies (collections of billions of stars), and everything else in space. People have wondered how the universe got started for thousands of years. Most scientists now think they have the answer. They think the universe began about 14 billion years ago with a kind of big explosion. They call the explosion the big bang.
WHAT HAPPENED AFTER THE BIG BANG?
No one knows what caused the big bang, but scientists think they know what happened all the way back to the first seconds after the big bang.
The brand new universe was very hot and very small. It blew outwards very fast. In the first three minutes, matter started to form. Hundreds of years later, the universe looked like a big ball of fire.
You can picture the universe as something like a black balloon with white dots painted on it. The black represents space and the white dots are galaxies. Blowing air into the balloon makes it bigger. The spaces between each dot get farther apart as the balloon expands.
As it got bigger, the universe got cooler. Hydrogen gas formed. The gas broke into clumps. The clumps came together to make galaxies and stars. Other kinds of matter formed in the stars. Finally, planets like Earth formed around some stars.
IS THERE PROOF OF A BIG BANG?
The expansion of the universe is evidence for the big bang. American scientist Edwin Hubble studied light coming from galaxies far out in the universe. In 1929, he found that the galaxies were speeding away from Earth and from each other in all directions. Scientists tracked the paths of the galaxies back to their starting place. They saw that all the galaxies must have started from the same place. Packing all that matter into a small area would make a very dense, searing hot ball—the big bang.
Scientists use math to describe how the universe behaves. In the early 1900s, German American scientist Albert Einstein came up with equations that predict an expanding universe. These equations have correctly predicted the motions of stars, planets, and light.
More proof came in the 1990s from a spacecraft called the Cosmic Background Explorer (COBE). COBE saw rays coming from far off in the universe. The rays are left over from the early days of the universe. They could only have been created in a much smaller and hotter universe long ago.
WILL THE UNIVERSE KEEP EXPANDING?
Scientists are not sure what will happen to the universe. They currently think it will keep expanding forever. They even think the expansion is speeding up. But scientists are still studying this question.


Comments

Post a Comment

Popular posts from this blog

Pakistani man's uncanny resemblance to GoT's Tyrion Lannister is too much to ignore!

Image
© Provided by The News International PESHAWAR: Picture of a man bearing uncanny resemblance to famed HBO series Game of Thrones' character Tyrion Lannister, has been doing rounds on social media of late. Shared by an internet user on Twitter, the image showcases an unidentified man belonging to Peshawar having stark similarity to the House of Lannister stalwart Tyrion Lannister, played by globally recognised Hollywood actor Peter Dinklage. View image on Twitter Farrukh @AbyyLay found Tyrion Lannister in Peshawar, Pakistan 1,591 5:14 PM - Feb 12, 2019 829 people are talking about this Twitter Ads info and privacy While Pakistanis are excited to finally get their own Tyrion Lannister, others cannot help but gape at the eerie likeness between the two. Some have even hilariously commented that they now have a local Tyrion Lannister from House of Pekhawar. Here's how the internet world has reacted to the image: ...
Read more

Latest Recruitment at The National Open University of Nigeria (NOUN)

The  National Open University of Nigeria  (NOUN) is an Open and Distance Learning (ODL) institution and is currently the largest public university in West Africa in terms of spread and number of actively registered students. It is a recognized university in the Nigeria University System. Contents Open Jobs Assistant Librarian (CONNUAS 1) Librarian II (CONNUAS 2) Librarian I (CONNUAS 3) Senior Laboratory Technologist (CONTISS 9) Laboratory Technologist I (CONTISS 8) Laboratory Technologist II (CONTISS 7) Professor (CONNUAS 7) Associate Professor (CONNUAS 6) Assistant Lecturer Senior Lecturer (CONNUAS 5) Lecturer I (CONNUAS 4) Lecturer II (CONNUAS 3) Method of Application Assistant Librarian (CONNUAS 1) Job Type Full Time    Qualification BA/BSc/HND    Location  Nigeria Job Field   Administration / Secretarial     Education / Teaching   Department: University Library Qualifications and Requirem...
Read more

Remember the Alamo

“Remember the Alamo!” is a famous battle cry from the old West. Who wanted to remember the Alamo and why? The Alamo is an old mission (church compound) in San Antonio, Texas. Spanish priests built it from sun-dried bricks, called adobe, in the early 1700s. High walls defended the mission. It later became a fortress. In 1836, a bloody battle was fought at the Alamo. Texan forces fought bravely against the Mexican army, but many Texans died. At that time, Texas was part of Mexico. Many Texans wanted to make Texas an independent country. “Remember the Alamo!” became a battle cry for Texas in its war of independence from Mexico. TEXAS REVOLTS! In the fall of 1835, the people of Texas decided they no longer wanted to be a part of Mexico. Texans were unhappy with the Mexican government. The Texans rebelled and gathered an army. Mexican president and general Antonio López de Santa Anna wanted to stop the revolt. In February 1836, he took more than 2,000 of his soldiers to San Antonio. A...
Read more