This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl.
The Hubble Space Telescope has captured the gradual disappearance of a supernova that shines far brighter than any star in a galaxy. Compiled in seconds from images observed over the course of a year between 2018 and 2019, the time-lapse video shows the supernova, which was about 5 billion times brighter than the sun, fading away.
This Type Ia supernova SN 2018gov was detected by amateur astronomer Koichi Itagaki in 2018. It is located at the edge of the barred spiral galaxy NGC 2525, about 70 million light-years from Earth. SN 2018gv was originally a white dwarf that continued to take in material from neighboring binary stars, it is thought to have reached its limit, resulting in a thermonuclear runaway event that led to a supernova explosion.
The supernova, which at the time of its detection shone brighter than any other star in NGC 2525, unleashed as much energy in a matter of days as our Sun does in several billion years, and then ran out of fuel and became dim.
Because the amount of light unleashed at the peak of this type of supernova is nearly uniform at 5 billion times that of the Sun, Type Ia supernovae can be compared to theoretical and observational data to calculate their distance from our planet with near-accuracy, which in turn provides data for determining the Hubble constant for calculating the expansion rate of the universe. Since its launch in April 1990, the Hubble Space Telescope has been instrumental in dramatically improving the accuracy of the expansion rate of the universe over the past 30 years.
This article is based on an article from the Japanese edition of Engadget and was created using the translation tool Deepl. The Japanese edition of Engadget does not guarantee the accuracy or reliability of this article.