hvězdy
exoplanety
zprávy
Projděte si nejnovější vědecké studie o hvězdách a exoplanetách v naší galaxii. Objevte nejnovější výzkumy astrofyziky a hvězdné astronomie.
Aktuální výzkum
Další výzkum
Advertisement
Hvězdy 1-20
>
Hvězdy 1-20
>
v našem katalogu
Červení trpaslíci zprávy
Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
15. 10. 2026
Hvězdy | Exoplanety | Červení trpaslíci | Superzemě | Atmosféry planet | TESSTOI-2257 b represents a unique case in planetary science due to its 35-day orbital period and high eccentricity, which describes how much an orbit deviates from a perfect circle. Located in a sparsely populated region of planetary parameter space, it sits at a critical threshold where the combined effects of stellar radiation and tidal forces - gravitational stresses caused by the host star - begin to lose their influence over the planet. Simulations show that the planet remains near this transi...
Read article 
Advertisement
6. 10. 2026Hvězdy | Exoplanety | Červení trpaslíci | Vesmírný dalekohled Jamese Webba | Atmosféry planet | Oceánské planetyAnalysis of sub-Neptune planets around Red dwarf stars using JWST data reveals a new category of hybrid worlds. These planets have atmospheric compositions that do not align with traditional gas dwarf or water world definitions. Study highlights include TOI-776 c....
Read article 3. 10. 2026Hvězdy | Exoplanety | Červení trpaslíci | Vesmírný dalekohled Jamese Webba | Atmosféry planeAnalysis of four transit observations of TRAPPIST-1 c shows the planet is likely airless. By using a new method to account for stellar activity, researchers ruled out thick carbon dioxide and nitrogen atmospheres for this rocky exoplanet....
Read article Research in Červení trpaslíci
Frequently Asked Questions about nearby stars
What is the nearest star?
Nearest star is Proxima Centauri, located approximately 4.24 light-years (1.30 parsecs) from the Sun. It is part of the Alpha Centauri star system, which also includes Alpha Centauri A and Alpha Centauri B.
What are the nearest stars to Earth?
Nearest stars to Earth include the Alpha Centauri system (Alpha Centauri A, Alpha Centauri B, and Proxima Centauri), Barnard's Star, and Wolf 359. There are also brown dwarfs Luhman 16 and WISE 0855−0714.
What is the solar neighborhood?
Solar neighborhood (also Local Interstellar Cloud) is the region of interstellar space that surrounds the Sun with diameter about 15 light years. Stellar Catalog database includes all stars contained within this region.
How do astronomers measure distances to stars?
Astronomers use methods like parallax, standard candles, and redshift to measure distances to stars. Parallax is especially useful for nearby stars in our solar neighborhood, while other techniques help map the universe beyond.
Are there any exoplanets orbiting the nearest stars?
Yes, several exoplanets have been discovered orbiting the nearest stars. For example, Proxima Centauri has an exoplanet called Proxima Centauri b, which is located in the star's habitable zone and is the closest known exoplanet to Earth.
Why are the nearest stars important for astronomy and physics?
The nearest stars provide valuable laboratories for studying stellar evolution, space environments, and the fundamental physics of stars. Observing these stars helps astronomers understand the structure of our galaxy and the broader universe.
Advertisement
StellarGuide: Hvězdy
Hvězdy
Hvězdy jsou obrovské koule horkého plynu, které září díky energii vznikající jadernou fúzí v jejich jádru. Většina hvězd se skládá převážně z vodíku a helia. V centru hvězdy dochází díky vysokému tlaku a teplotě k přeměně vodíku na helium, přičemž se uvolňuje obrovské množství energie ve formě světla a tepla.More about Hvězdy