When you accidentally discover a bright star in the vast universe and black night sky, there is a moment when you suddenly wonder about the life of the star.
With the development of technology, it has become possible to clearly observe many moments of stars that are difficult to observe with the naked eye.
According to the international journal Nature on the 19th (local time), a research team from the University of Alberta in Canada has discovered 21 new supernova remnants.
Normally, the lifespan of a star is determined by its initial mass, but when it becomes heavy after repeating hydrogen fusion reactions for a long time, it causes a big explosion.
At this time, the star emits the energy that the sun would emit throughout its lifetime, becoming a ‘supernova’ that emits more than 10,000 times more light and disappears gradually.
A star in the Milky Way explodes in a supernova at least once every 100 years, throwing out clouds of dust and gas several light years away.
This debris contains useful information about the galaxy, such as the type of star that exploded, other stars or planets, and life, and is used as meaningful data for astronomers to study the universe.
Normally, stellar remnants are detected by radio emissions during the explosion, but most of them were not detectable because the radio waves fainted.
But recently, a team of PhDs from the University of Alberta, Canada, led by Brianna Ball, has discovered a new way of tracking supernova traces.
It is a combination of images from two radio telescopes with good technology.
One is ASKAP (Australian Square Kilometer Array Array Pathfinder), a radio telescope with 36 antennas in Western Australia, and the other is Parkes Observatory, a radio telescope in New South Wales, Australia.
The result was the discovery of 21 new, never-before-seen supernova remnants in the night sky.
In the published images, five of the 21 newly discovered supernova remnants are brightly colored.
The color in the picture represents temperature, with purple in the coldest area. Blue, green and red follow, with white representing the hottest areas.
Dr Brianna said, “We are only now discovering supernova remnants that previous telescopes did not have the resolution or sensitivity to detect,” and added, “I look forward to discovering more (supernova) remnants in the future.”
Previously, in July last year, NASA released to the public an image captured by the James Webb Space Telescope (JWST) of a dying star.
▲ Southern Ring Nebula taken by JWST. Scenes seen with near-infrared wavelengths on the left and mid-infrared wavelengths on the right.
Even in the image of the Southern Ring Nebula, a planetary nebula released by NASA at the time, you can see the expanding gas cloud around the dying star.
▲ Eunha So from ‘Stephan’s Quintet’ released by NASA
Then, in 1877, the first small group of galaxies, ‘Stephen’s Quintet’, shows cosmic dust more clearly than in the previous picture.
NASA presented this image as “a scene where galaxies collide” and emphasized that “it provides new insights into how interactions between galaxies in the early universe led to the evolution of the universe.”
(Image = Twitter ‘NASA’, Captured from the homepage of the journal Nature)