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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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Hnědí trpaslíci zprávy
Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
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Hvězdy | Exoplanety | Oranžový trpaslík | Hnědí trpaslíciThe massive brown dwarf known as HD 203771 b has been characterized as orbiting its host orange dwarf star once every 1140 days. Brown dwarfs are often called failed stars because they are more massive than planets but not heavy enough to sustain the nuclear fusion that powers stars. This particular companion follows an eccentric, or elongated, path that is inclined at an angle of approximately 130 degrees relative to its host. The host star itself has a mass estimated at 0.79 times that of the ...
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9. 10. 2026Hvězdy | Hnědí trpaslíci | Atmosféry planeAnalysis of three early L-dwarfs, HD 89744 B, Gliese 1048 B, and LSPM J0632+5053 B, reveals gaseous silicon monoxide and silicate clouds in their atmospheres. JWST data confirms these mineral clouds form as silicon gas condenses, mimicking processes in giant planets....
Read article 9. 10. 2026Hvězdy | Exoplanety | Hnědí trpaslíciA new exoplanet candidate, PALTA-1 b, has been identified orbiting the nearby ultracool dwarf star DENIS-P J1253108-570924. The planet, which has a mass roughly equivalent to a fraction of Jupiter, was found after eight years of precise positional monitoring....
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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