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Projděte si nejnovější vědecké studie o hvězdách a exoplanetách v naší galaxii. Objevte nejnovější výzkumy astrofyziky a hvězdné astronomie.
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Červení trpaslíci zprávy
Ammonia and hydrogen may separate inside Uranus and Neptune
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Hvězdy | Exoplanety | Červení trpaslíciAmmonia and hydrogen can separate into distinct, hydrogen-rich and ammonia-rich phases under conditions expected inside some planets. Simulations indicate that the boundary between mixing and separation crosses published temperature profiles for Uranus and Neptune. This suggests ammonia may be raining out inside both planets today, moving from their hydrogen-rich envelopes into ammonia-rich regions.
The simulations covered temperatures from 500 to 4,000 kelvins and pressures from 0.1 to 100 g...
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15. 10. 2026Hvězdy | Exoplanety | Červení trpaslíci | Superzemě | Atmosféry planet | TESSThe exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
Read article 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....
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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.
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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