How are new stars different from supernovae? Detailed answer

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How are new stars different from supernovae? Detailed answer

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How are new stars different from supernovae?

There are stars whose brightness increases very quickly: a star, flaring up for several days or even hours, suddenly flares up. The luminosity during a flash can increase tens of millions of times! Then the brightness of the star begins to fade, first rapidly and then slowly, and the star eventually becomes the same as it was before the outburst. Such stars are called novae. Amateur astronomers often discover such stars. It used to be thought that this was indeed a re-emerging star. But all these stars existed before, only they were found with difficulty because of their weak luminosity.

Many of the new stars flare up repeatedly. What makes stars explode? Very hot stars are often in an unstable state. Energy bursts out of their bowels, the outer gas layers break off and rush into space with great speed, only to dissipate later. After the explosion, in a year or two around the weakened star, a gaseous nebula becomes visible in telescopes, bright, expanding. The ejected shell, illuminated by the star, moves away from it, dissipates in space. A new star is not destroyed during a flash, but only throws off part of its stellar matter. There are over 200 new stars, and most of them are in the Milky Way.

Sometimes explosions of stars are of such enormous power that the luminosity increases enormously - hundreds of millions of times! And the star is destroyed. Such a star is called a supernova. Supernova explosions are an extremely rare but remarkably bright phenomenon. Such stars become so bright during the flash that they can be seen with the naked eye even during the day. Over the past millennium, five supernovae have exploded.

Author: Cellarius E.Yu.

Random interesting fact from the Great Encyclopedia:

Who painted the nude version of the Mona Lisa?

One of Leonardo da Vinci's students was a young man named Salai. Many art critics are sure that he was the model for Leonardo's paintings "John the Baptist" and "Bacchus". There are also versions that Salai, dressed in a woman's dress, served as the image of the Mona Lisa herself, and that there was an intimate relationship between the student and the teacher. The works of Salai himself are little known, one of them is a nude version of the Gioconda called "Monna Vanna".

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E. coli bacteria for electricity production 17.09.2023

Researchers from the Swiss Federal Institute of Technology of Lausanne (EPFL) have made a significant breakthrough by creating an artificially modified strain of E. coli that is capable of generating electricity from brewery wastewater. This strain has surpassed the effectiveness of even the latest bioengineering developments in this area.

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