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How Big Is The Universe?
Transcript of How Big Is The Universe?
and galaxies can move at 200km/s, a lot faster than a bullet This is one of the hardest question to answer, because, at this point, we simply can't determinate the size of the universe. So, since it's creation, the universe is in continues expansion.At every billion years, the universe increases in size by 10%-15%. Here are some comparisons between planets and stars: It's so big that it would take a plane 1200 years to travel around it one time. But how can we measure cosmic distances and sizes of stars? Yet,this is only a tiny dot among other stars... This is the star by which we want to measure the distance We take as base line the diameter of Earth's orbit Sun Earth We measure this angle Earth's position after six months We measure this angle First, we need to know which is the length units we use to calculate the distances. = 9.4605284*10^15 meters
Parsec = 3.08567758*10^16 meters
kiloParsec = 3.08567758*10^19 meters
megaParsec = 3.08567758*10^22 meters The easiest way to measure cosmic distances is Triangulation This is how it works: Light year l=d/tana+d/tanb d=l/tana+l/tanb d=l*(sina*sinb)/sin(a+b) Calculation: This principle is known since the 17th century, but at that time the instruments weren't capable of measuring such angles. In 1848 the technology caught up and Bessel, an astronomer, found that the binary star 61 Cygni was at an outstanding 60 trillion miles away, equal to 10,3 light years. In 1987, a star was seen to explode inside our galaxy.It was a In that moment our universe just got bigger. As it happen, this supernova was surrounded by a huge gas cloud. SuperNova . After the Supernova exploded it took light 8 moths to reach the gas cloud Earth And using simple triangulation scientists calculated that this star is at a distance 169.000 light years from the Earth. This means that we were looking at an event that took place 169.000 years in the past. this is VY Canis Majoris, the biggest star that we have discovered Red Giant Now, our universe was huge. Astronomers could see strange clouds through their telescopes.Some astronomers thought that this could be be other galaxies just like ours. In 1917 a supernova was seen ro explode inside a cloud called Andromeda Lets' talk a little about our own star The Sun The Sun is a medium sized star and is approximately 4.6 billion years old In about 5 billion years it will become a red giant,and than it will collapse into a much smaller,but denser White Dwarf The distance between the Earth and the Sun is about 149,597,870,700 meters. As a red giant, the radius of the Sun would drastically increase, swallowing the first planets and it would stop right in front of the Earth. The nearest star to our solar system is Proxima Centauri, located in the alfa Centauri system. The distance between Proxima Centauri and Earth is about 4.2 light years. Our galaxy, the Milky Way has 200 billion stars. The nearest galaxy to the Milky Way is thought to be the Canis Major Dwarf galaxy. It is located at about 25000 light years from the Milky Way The nearby Andromeda galaxy has 1 trillion stars. The biggest galaxy discovered by us has 100 trillion stars. There are 100 billion galaxies in the observable Universe If you put those numbers together, you get an estimate of about 10^24 stars in the Universe That’s 1,000,000,000,000,000,000,000,000 stars. I have an opinion about the Universe. Let us assume the Universe is an balloon and we have a pump. We start inflating the balloon.The balloon is getting bigger and bigger, but it's not infinite.Infinite is the amount of air we have in the pump. So this is it.Nobody really knows what is the distance from one extremity to the other, but one day, I am sure that we will know because humans never give up until they have an answer to every question that they ask. Questions? Bibliography en.wikipedia.org
ESA But the question that we want to answer is : How large is our Universe? What an intricate question and almost impossible to answer.