When stars run out of fuel, their lives also end. Stars have different destinies depending on their mass, and stars with a lot of mass end their lives with a supernova explosion. But the smaller stars eject part of their mass, which eventually forms a planetary nebula, leaving a small, dense nucleus called a white dwarf.
Our sun one day, like most stars, turns into a white dwarf and glows with the rest of its heat. White dwarfs do not generate their energy by fusion of the nucleus, but they are still active.
Because only small nuclei of this type of star remain after death, white dwarfs are very dense, and their gravity can greatly affect the objects around them. The Hubble Space Telescope recently broadcast an image of a cosmic cannibalism in which white dwarf rock and ice material surrounds it. میبلعد.
Named G238-44, this white dwarf is the first star to be seen swallowing icy objects and rocky objects around it. These materials around the stars are the raw materials for the formation of planets and are therefore very important. By studying this white dwarf, astronomers can now gain a better understanding of how planets form.
How planets form
To this day, we know that when stars like the Sun are turning into red giants, they swallow every planet near them, just before they throw their material out and turn into a white dwarf. Now that Hubble has observed white dwarfs as they swallow planet-forming material, astronomers can study the material that formed the previous planets.
Given that there is ice around this white dwarf, astronomers believe that comets are a common phenomenon in most extrasolar systems. In addition, these data confirm the theory of water transfer from a follow-up collision to Earth.