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Cygnus X-1 is an X-ray binary system in the constellation Cygnus consisting of a compact object and the blue supergiant star HDE 226868. The compact object draws matter from the companion's stellar wind, producing intense X-rays in an accretion flow, and is classified as a stellar-mass black hole. O...

PSR B1257+12 is a rapidly rotating neutron star, or millisecond pulsar, in the constellation Virgo. Astronomers Aleksander Wolszczan and Dale Frail announced in 1992 that timing variations in its pulses revealed planets orbiting the pulsar, producing the first confirmed discovery of planets outside...

V645 Centauri is an M-type red dwarf star located within the Alpha Centauri system, approximately 4.37 light-years from Earth. It’s notable for frequent flares—sudden bursts of energy—characteristic of many red dwarfs. This proximity makes it a subject of interest for astronomers studying stellar va...

TRAPPIST-1 is an ultra-cool dwarf star located approximately 40 light-years from Earth. It’s notable for hosting a system of seven small, rocky planets. These planets, primarily orbiting within the habitable zone, are of interest to astronomers studying potential conditions suitable for liquid water...

Alpha Centauri A is a G-type main-sequence star located in the Alpha Centauri system, approximately 4.37 light-years from Earth. As the larger component of this binary star system, it closely resembles our Sun in terms of size and spectral type. This makes it a significant subject for astronomical r...

Proxima Centauri is a red dwarf star located just over four light-years away, making it our nearest stellar neighbor. It’s notable for being the host of Proxima Centauri b, an exoplanet within the habitable zone of its system. This makes it a key target for astronomers studying potentially habitable...

Eta Carinae is an exceptionally large and volatile star located within the Carina Nebula. It’s notable for its dramatic past eruptions, including a significant outburst in the 1840s that reshaped its appearance. As a luminous blue variable, it exhibits intense fluctuations in brightness. Scientists...

Delta Cephei is a bright supergiant star within the Cepheus constellation. It’s notable as the original prototype for Cepheid variable stars, identified by John Goodricke in 1784. Its consistent brightness fluctuations are crucial for astronomers to determine distances across vast stretches of space...

Polaris is a bright star located in the constellation Ursa Minor. It’s notable as the current North Star due to its position near the celestial pole and its classification as a Cepheid variable. This means it pulsates with varying brightness, making it valuable for astronomers studying stellar dista...

Betelgeuse is a massive red supergiant star located within the constellation Orion. It’s notable due to its immense size and status as a pre-supernova object, making it a key subject for astronomers studying stellar evolution and potential catastrophic events. Scientists investigate Betelgeuse to un...

Rigel is a brilliant blue supergiant star located within the constellation Orion. It’s notable for its extreme luminosity, making it readily visible and historically important for navigation. As one of the brightest stars in our sky, Rigel is observed by astronomers studying stellar evolution and th...

Vega is a main sequence A-type star located in the constellation Lyra approximately 25 light-years from Earth. It’s notable for its bright blue-white color and historical significance as the northern pole star. Vega plays a key role in the Summer Triangle asterism and contains a surrounding debris d...

Arcturus is a prominent K-type giant star located in the constellation Boötes. It’s notable for being the brightest star visible in the northern sky and situated relatively close to our solar system at approximately 37 light-years away. Astronomers and amateur stargazers find it particularly useful...

Sirius is the most luminous star visible from Earth. It’s a binary star system consisting of a brilliant white A-type main sequence star and a smaller companion. Located in the constellation Canis Major, Sirius has been observed for millennia, serving as a key navigational reference point for sailor...

The Sun is a G-type main sequence star, our closest stellar neighbor. This yellow dwarf provides nearly all the energy that sustains life on Earth through nuclear fusion in its core. Its consistent output of light and heat makes it essential for planetary habitability and supports a vast range of bi...

51 Pegasi is a G-type main-sequence star located approximately 50 light-years from Earth within the Pegasus constellation. It gained prominence as the first host star of an exoplanet discovered orbiting a Sun-like star. The discovery by Mayor and Queloz in 1995 revolutionized planetary science and d...

Canopus is a massive, white-yellow supergiant star located in the Carina constellation. It’s notable for being the second brightest celestial object visible from Earth. Historically, navigators utilized Canopus as a key navigational reference point, particularly for spacecraft due to its consistent...

PSR B1919+21 is a radio pulsar in the constellation Vulpecula and is understood to be a rotating neutron star. Jocelyn Bell Burnell detected its regular radio pulses in 1967 while working with a radio telescope at Cambridge, and Antony Hewish led the group that reported the discovery. Originally des...

Sirius B is a dense white dwarf star orbiting within the Sirius system of Canis Major. It represents the remnant core of a once-massive star that exhausted its nuclear fuel. This object’s extreme density—a sun's mass packed into Earth-sized volume—makes it a valuable subject for astronomical researc...

Algol is a binary star system notable for its predictable dimming due to an eclipsing orbit. The primary and secondary stars regularly pass in front of each other from our perspective, causing fluctuations in brightness. This behavior was one of the first astronomical phenomena to be explained throu...

Aldebaran is a red giant star located in the constellation Taurus approximately 65 light-years from Earth. As the brightest star within Taurus, it’s a prominent navigational aid and has been historically significant to cultures observing the night sky. Its classification as a K-type star indicates i...

Altair is a brilliant A-type main-sequence star located within the constellation Aquila. Situated just 17 light-years from Earth, it’s notable for its exceptionally fast rotation rate. This rapid spin causes a flattening of the star at its poles. Altair represents a key nearby star system and is par...

RR Lyrae is a variable star in the constellation Lyra and the prototype of the RR Lyrae class of pulsating variable stars. These stars regularly expand and contract in size and brightness over periods typically lasting less than a day. Because their intrinsic luminosity is predictable, astronomers u...

Alpha Centauri B is a K-type main-sequence star located approximately 4.37 light-years from Earth in the Alpha Centauri star system. It orbits the larger and hotter G-type star Alpha Centauri A, forming a binary pair. Together with the red dwarf Proxima Centauri, these stars make up the closest stel...

Mira, designated Omicron Ceti, is a red giant star located approximately 420 light-years away in the constellation Cetus. It serves as the prototype for a class of long-period variable stars, known as Mira variables, which undergo dramatic changes in brightness due to physical pulsations. The star's...

Acrux, officially designated Alpha Crucis, is the brightest star in the southern constellation of Crux, commonly known as the Southern Cross. Located approximately 320 light-years from Earth, it appears as a single point of light to the naked eye but is actually a complex multiple star system compos...

The star TW Hydrae is a nearby classical T Tauri star in the constellation Hydra, about 176 light-years from Earth. It is surrounded by a gas-and-dust protoplanetary disk whose structure includes a prominent gap observed by the Hubble Space Telescope. The gap has been interpreted as possible evidenc...

T Tauri is a variable star found in the Taurus molecular cloud and serves as the prototype for the class of pre-main-sequence stellar objects known as T Tauri variables. Discovered in October 1852 by John Russell Hind, the star is part of a multiple-star system that includes several nascent celestia...

Spica, designated Alpha Virginis, is the brightest star in the constellation of Virgo and a prominent binary star system. Located approximately 250 light-years from Earth, the system consists of two massive B-type stars orbiting so closely that their mutual gravity distorts them into ellipsoidal sha...