Stars, as physical systems, are self-gravitating, approximately hydrostatic spheres of plasma in which energy is generated predominantly by thermonuclear fusion in their cores and transported outward by radiation and/or convection. Their structure is governed by the equations of stellar structure, balancing gravity, gas and radiation pressure, and energy transport. Stellar properties such as mass, composition, and rotation determine their internal stratification, nucleosynthetic pathways, luminosity, temperature, and evolutionary tracks. Stars interact with their environments via radiation, stellar winds, and mass loss, and they serve as fundamental sites of element synthesis and key components of galactic and cosmological structure.
Astronomers have studied the globular cluster 47 Tucanae extensively, but still have many questions. It may have an intermediate mass black hole in its center like Omega Centauri is expected to have. There are reasons to ...
Astronomy
Jul 8, 2025
0
132
Using a combination of telescopes, astronomers have characterized the closest supernova linked to a fast X-ray transient. The observations reveal that these bright blasts of X-rays may be the result of a "failed" explosive ...
Astronomy
Jul 7, 2025
0
36
Imagine a star so dense that a teaspoon of its material would weigh as much as Mount Everest, spinning hundreds of times per second while beaming radio waves across the universe. These are pulsars, the collapsed cores of ...
Astronomy
Jun 24, 2025
0
70
Identifying the formation period of planetary systems, such as our solar system, could be the beginning of the journey to discover the origin of life. The key to this is the unique substructures found in protoplanetary disks—the ...
Astronomy
Jun 24, 2025
0
126
Iron is one of the most abundant heavy elements in the universe. Its spectral features stand out in many astronomical spectra, especially in those of stars and galaxies. As a dominant emitter in many X-ray sources, iron ions ...
Astronomy
Jun 24, 2025
0
20
The Atacama Large Millimeter/submillimeter Array (ALMA) has uncovered a key piece of the puzzle in how rocky planets, such as Earth, form around young stars. For decades, scientists have struggled to explain how dust grains ...
Planetary Sciences
Jun 12, 2025
0
44
When a star explodes, it sends high-energy particles out in all directions. This burst of energy can travel through space for thousands of light-years, traversing solar systems and even galaxies.
Astronomy
Jun 11, 2025
4
198
An international team of astronomers reports the discovery of a new ultracompact binary of the AM CVn type exhibiting infrequent outbursts. The detection of the newfound system, designated TCP J07222683+6220548, was detailed ...
Across the cosmos, many stars can be found in pairs, gracefully circling one another. Yet one of the most dramatic pairings occurs between two orbiting black holes, formed after their massive progenitor stars exploded in ...
Astronomy
Jun 3, 2025
0
101
Identifying ancient Chinese astronomical events represents a fascinating aspect of modern astrophysics. Chinese astronomers maintained meticulous records of celestial events for more than 2 millennia, documenting everything ...
Astronomy
Jun 2, 2025
0
68
