Definitions for stellar evolution
stel·lar evo·lu·tion

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1. Stellar evolution

   Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star. Nuclear fusion powers a star for most of its existence. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core. This process causes the star to gradually grow in size, passing through the subgiant stage until it reaches the red giant phase. Stars with at least half the mass of the Sun can also begin to generate energy through the fusion of helium at their core, whereas more-massive stars can fuse heavier elements along a series of concentric shells. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula. Stars with around ten or more times the mass of the Sun can explode in a supernova as their inert iron cores collapse into an extremely dense neutron star or black hole. Although the universe is not old enough for any of the smallest red dwarfs to have reached the end of their existence, stellar models suggest they will slowly become brighter and hotter before running out of hydrogen fuel and becoming low-mass white dwarfs.Stellar evolution is not studied by observing the life of a single star, as most stellar changes occur too slowly to be detected, even over many centuries. Instead, astrophysicists come to understand how stars evolve by observing numerous stars at various points in their lifetime, and by simulating stellar structure using computer models.

How to pronounce stellar evolution?

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How to say stellar evolution in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of stellar evolution in Chaldean Numerology is: 2

2. Pythagorean Numerology

   The numerical value of stellar evolution in Pythagorean Numerology is: 4

Examples of stellar evolution in a Sentence

1. Wynn Jacobson-Galán:

   I am most excited by all of the new' unknowns' that have been unlocked by this discovery, detecting more events like SN 2020tlf will dramatically impact how we define the final months of stellar evolution, uniting observers and theorists in the quest to solve the mystery on how massive stars spend the final moments of their lives.

2. Brian Grefenstette:

   If we're seeing the birth of a compact object in real time, this could be the start of a new chapter in our understanding of stellar evolution, we looked at this object with many different observatories, and of course the more windows you open onto an object, the more you can learn about it. But, as we're seeing with the Cow, that doesn't necessarily mean the solution will be simple.

3. Alex Filippenko:

   This is the best known case for this interesting category of supernovae that is in between the mass range for the exploding white dwarf and the iron core of a massive star that collapses and then rebounds and leads to an explosion, the so-called core-collapse supernovae, this study significantly increases our understanding of the final stages of stellar evolution.

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Stellar_Evolution