Showing posts with label star universe. Show all posts
Showing posts with label star universe. Show all posts

Sunday, 20 January 2019

The brightest star in the universe




Do you know the brightest star. Happy reading, always want to know what mountains, seas or canyons are the highest, deepest or widest. And when observing the night sky, we always want to know what is the brightest thing. In terms of the stars seen from Earth, the brightest is Sirius Although it is the brightest star. Sirius is not the brightest sky object seen from Earth. Apart from the Sun and the Moon (which shines brighter brighter than Sirius) there are still planets such as Venus and Jupiter which also appear more radiant than the appearance of Sirius. Likewise Mercury and Mars, depending on their position in their orbits relative to the Earth, can be more aggressive. But, of all the true stars in the sky (not including the Sun), Sirius is the most brilliant, even about twice the brightness of the second brightest star in the sky, Canopus. As much as the star of the Sirius class is known to be larger than our Sun and shines with an absolute magnitude of 20 times the luminosity of the Sun. But, just like the Sun, Sirius is still in the main sequence phase, which means it still burns hydrogen at its core, not yet developing into the giant phase. Then, why can Sirius be so bright even though it is not a giant star? Apparently this is because the distance is relatively close to Earth. With a distance of only 8.6 light years, Sirius is arguably the sixth closest star of the Sun. Indeed, there are more stars close to us than Sirius, like the Alpha Centauri system which is 4.2 light years away. However, there is not one full that can match Sirius's absolute magnitude. Sirius is also not a single star like the Sun. He is not alone, but is a binary system (two stars circling each other). Sirius's companion star is known as a small (smaller than Earth) white dwarf named Sirius B. In view of Earth, Sirius is located in the direction of the constellation Kanis Mayor. In Indonesia, these constellations can be observed in the eastern sky during January around an hour after sunset. Sirius will be very easy to find because its appearance will be very bright compared to other stars.
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Tuesday, 8 January 2019

Longest Star in the Universe

     
     Thank you very much for those of you who have chosen to choose what is the longest-lived object in the universe. And yeah, here we will discuss the real answer and who among you is right? The answer is "Red Dwarf Star" !!!, want to know the reason why he is the winner? Come see the following explanation.
        What is the Red Dwarf Star? »So the red dwarf star is the type of star that stars can say with the lowest level, because indeed has a low surface temperature ranging from 2,500K to 3,000K, has a small size compared to the Sun, has a lower mass compared to the Sun. The red dwarf star has a reddish orange surface color in the visible light spectrum and is the object with the highest population in the universe, with a percentage reaching 70% in the main sequence star.
        Why Has a Long Life? » Just like stars in general, this type of star also performs fusion reactions in its core to maintain the balance of pressure from outside and inside the star is also formed like a star in general, only the amount of material that exists when its formation has less so that the star has a low mass. The low mass also causes a decrease in pressure and temperature, so the process of converting hydrogen atoms to heavier atoms becomes very long.
      The very long process that makes a red dwarf star has a long life span, its age can be more than 10 billion years or longer than the age limit of a star like the Sun. In contrast to stars that have mass, high pressure and temperature which causes the fusion process to run very fast, which makes the star has a short life, usually this is a star class O and B.
       Example of a Red Dwarf Star - A red dwarf star is a star commonly found in the universe so it's not too difficult to find it. Here are some examples of red dwarf stars, namely;
-Proxima Centauri Barnard Star
-Gliese 832
-Ross 128
-etc
Now that's him guys, why do red dwarf stars have a very long life What do you think? Are there more objects that have a long life time.
  
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