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Any naturally-occurring object such as a star or nebula known to exist in the universe..
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| Ma | Ma | ||||
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| x name | x image | x Category | x article | x Age | |
| x Age (Ma) | x Uncertainty (Ma) | ||||
| x Moon |
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Natural satellite |
The Moon is the only natural satellite of the Earth, and the fifth largest satellite in the Solar System. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having a quarter the diameter of Earth...
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4,527 Ma | |
| x Mars |
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Planet |
Mars is the fourth planet from the Sun in the Solar System. Named after the Roman god of war, Mars, it is often described as the "Red Planet" as the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a terrestrial planet with...
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4,500 Ma | |
| x Venus |
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Planet |
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. The planet is named after Venus, the Roman goddess of love and beauty. After the Moon, it is the brightest natural object in the night sky, reaching an apparent magnitude...
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4,500 Ma | |
| x Mercury |
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Planet |
Mercury is the innermost of the eight planets in the Solar System. It is also the smallest, and its orbit has the highest eccentricity of the eight. It orbits the Sun once in about 88 Earth days, completing three rotations about its axis for every...
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4,500 Ma | |
| x Jupiter |
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Planet |
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter...
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4,500 Ma | |
| x Saturn |
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Planet |
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Named after the Roman god Saturn, its astronomical symbol (♄) represents the god's sickle. Saturn is a gas giant with an average radius about...
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4,500 Ma | |
| x Neptune |
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Planet |
Neptune is the eighth and farthest planet from the Sun in the Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third largest by mass. Neptune is 17 times the mass of Earth and is slightly more...
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4,500 Ma | |
| x Earth |
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Planet |
Earth (or the Earth) is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world, the...
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4,540 Ma | |
| x Beta Ursae Majoris |
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Star |
Beta Ursae Majoris (β UMa, β Ursae Majoris) is a star in the northern circumpolar constellation of Ursa Major. It has the traditional name Merak. The name is derived from the Arabic المراق al-maraqq "the loins" (of the bear). The apparent visual...
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| x Polaris |
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Star |
Polaris (α UMi, α Ursae Minoris, Alpha Ursae Minoris, commonly North Star, Northern Star or Pole Star, also Lodestar, sometimes Guiding star) is the brightest star in the constellation Ursa Minor. It is very close to the north celestial pole, making...
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| x Uranus |
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Planet |
Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. It is named after the ancient Greek deity of the sky Uranus (Ancient Greek: Οὐρανός), the father of Cronus ...
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4,500 Ma | |
| x Sun |
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Star |
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields. It has a diameter of about 1,392,000 km, about 109 times that of Earth, and its mass (about 2×10...
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| x GJ 388 | Star |
AD Leonis (Gliese 388) is a red dwarf star. It is located relatively near the Sun, at a distance of about 16 light years, in the constellation Leo. AD Leonis is a main sequence star with a spectral classification of M3.5V. It is a flare star that...
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| x Epsilon Sagittarii | Star |
Epsilon Sagittarii (ε Sgr, ε Sagittarii) is a binary star system in the southern zodiac constellation Sagittarius. The star forms the base of the archer's "bow" in Sagittarius and also marks the base of the spout of the so-called "Teapot" asterism....
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| x J Centauri | Star |
J Centauri (J Cen) is a star in the constellation Centaurus. It is approximately 350 light years from Earth.
J Centauri is a spectral class B3V main sequence star with a mean apparent magnitude of 4.5 and a luminosity 500 times that of the Sun. The...
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| x Alpha Leporis | Star |
Alpha Leporis (α Lep, α Leporis) is the brightest star in the constellation Lepus. It has the traditional name Arneb, from the Arabic أرنب ’arnab "hare".
This is an massive star with about 14 times the mass of the Sun. The interferometer-measured...
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| x 14 Herculis |
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Star |
14 Herculis or 14 Her is an orange dwarf star approximately 59 light-years away in the constellation Hercules. Because of its apparent magnitude, the star cannot be seen with the naked eye. As of 2006, it is thought that 14 Herculis has two...
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| x Procyon |
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Star |
Procyon (α CMi, α Canis Minoris, Alpha Canis Minoris) is the brightest star in the constellation Canis Minor. To the naked eye, it appears to be a single star, the seventh brightest in the night sky with a visual apparent magnitude of 0.34. It is...
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| x YZ Ceti |
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Star |
YZ Ceti is a red dwarf star in the constellation Cetus. Although it is relatively close to the Sun at just 12 light years, this star cannot be seen with the naked eye. It is classified as a flare star that undergoes intermittent fluctuations in...
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| x La Superba | Star |
La Superba (Y CVn, Y Canum Venaticorum) is a star in the constellation Canes Venatici, well-known for its strikingly red appearance.
La Superba is a semi-regular variable star, peaking at about +4.8 mag and diminishing to around +6.3 over a 160 day...
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| x HD 224693 | Star |
HD 224693 (also known as HIP 118319) is a yellow subgiant star approximately 320 light-years away in the constellation Cetus.
In 2006, an extrasolar planet was discovered orbiting HD 224693 by the Keck telescope using radial velocity measurements. A...
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| x Eta Ophiuchi | Star |
Eta Ophiuchi, also known as η Oph or η Ophiuchi, is a star in the constellation Ophiuchus. It has the traditional name Sabik.
η Oph is actually a binary star system that is difficult to resolve in amateur telescopes but whose true nature has been...
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| x Chi1 Orionis |
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Star |
Chi Orionis (χ Ori, χ Orionis) is a star about 28 light years away. It is in the constellation Orion.
χ Ori is a main sequence dwarf star of spectral type G0V. It has a faint companion with a mass estimated at about 15% of the mass of the Sun, an...
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| x Gliese 673 | Star |
Gliese 673 is an orange dwarf star in the constellation Ophiuchus. It has a stellar classification of K7V. Main sequence stars with this spectra have a mass in the range of 60-70% of solar mass (comparable to the members of the binary star system 61...
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| x Rho Cassiopeiae |
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Star |
Rho Cassiopeiae ( /ˌroʊ kæsiəˈpiː.iː/; ρ Cas, ρ Cassiopeiae) is a yellow hypergiant star in the constellation Cassiopeia. It is about 11,650 light-years (3,570 pc) away from Earth, yet can still be seen by the naked eye (in the Northern Hemisphere...
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| x HD 38529 | Star |
HD 38529 (138 G. Orionis) is a binary star approximately 128 light-years away in the constellation of Orion.
HD 38529 A is a yellow subgiant star, which has also been classified as a main sequence dwarf of spectral type G4V. It is about 40% more...
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| x 82 Eridani | Star |
82 G. Eridani is a star about 20 light years away from Earth in the constellation Eridanus. It is a main-sequence star with a stellar classification of G8.
In the southern-sky catalog Uranometria Argentina, 82 G. Eridani (sometimes abbreviated to ...
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| x Rigel |
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Star |
Rigel (β Ori, β Orionis, Beta Orionis) is the brightest star in the constellation Orion and the sixth brightest star in the sky, with visual magnitude 0.18. Although it has the Bayer designation "beta", it is almost always brighter than Alpha...
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| x VV Cephei |
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Star |
VV Cephei, also known as HD 208816, is an eclipsing binary star system located in the constellation Cepheus, approximately 2,400 light years from Earth.
A red hypergiant fills the system's Roche lobe when closest to its companion blue star, the...
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| x Iota Persei | Star |
Iota Persei (ι Per, ι Persei) is a main sequence dwarf star in the constellation Perseus. It is somewhat larger and greater in mass than the Sun, and is located about 34 light years distant. Iota Persei has a relatively high proper motion across the...
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| x HD 211415 | Star |
HD 211415 is a binary star system in the constellation Grus. It has a relatively high proper motion and is located about 44 light years from the Sun.
These two stars have an orbit with a semi-major axis of 3.4″, which is approximately equal to 46 A...
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| x Achernar |
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Star |
Achernar (α Eri, α Eridani, Alpha Eridani), sometimes spelled Achenar, is the brightest star in the constellation Eridanus and the ninth-brightest star in the night sky. Of the top ten apparent brightest stars (excluding our Sun)—Sirius, Canopus,...
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| x HR 753 | Star |
HR 753 (also known as 268 G. Ceti) is a triple star system in the constellation of Cetus. It is located relatively near the Sun at an estimated distance of less than 24 light years, but even the brightest component is too faint to see directly with...
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| x 79 Ceti |
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Star |
79 Ceti (also known as HD 16141) is a yellow subgiant star approximately 127 light-years away in the constellation Cetus. It has stopped hydrogen fusion in its core, this implies an age much higher than our Sun's 4.5 billion years. Eventually the...
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| x SCR 1845-6357 | Star |
SCR 1845-6357 is a binary system, about 12.6 light-years away in the constellation Pavo. The primary is a faint red dwarf star. It has a brown dwarf companion.
The primary, SCR 1845-6357A, is a faint (apparent magnitude 17.4) red dwarf star with a...
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| x HD 149026 | Star |
HD 149026 is a yellow subgiant star approximately 257 light-years away in the constellation of Hercules. The star is thought to be much more massive, larger, and brighter than the Sun. As of 2005, an extrasolar planet has been confirmed to be...
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| x L Centauri | Star |
HD 110073 (Bayer designation l Cen / l Centauri) is a star in the constellation Centaurus. It is a blue-white B-type bright giant with an apparent magnitude of +4.63 and is approximately 365 light years from Earth.
This is a single-lined...
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| x 25 Arietis | Star |
25 Arietis is a star in the constellation Cetus. Its apparent magnitude is +6.45.
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| x 100 Aquarii | Star |
100 Aquarii (100 Aqr) is a star in the constellation of Aquarius.
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| x Gamma Velorum | Star |
Gamma Velorum (γ Vel, γ Velorum) is a star system in the constellation Vela. At magnitude +1.7, it is one of the brightest stars in the night sky. It has the traditional names Suhail and Suhail al Muhlif, which confusingly also apply to Lambda...
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| x Delta Cygni | Star |
Delta Cygni (δ Cygni, δ Cyg) is the third-magnitude star in the constellation Cygnus. It has the traditional name Rukh. It will be the "North Star" for at least four centuries around 11,250.
This star belonged to the Arabic asterism al-Fawāris ...
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| x Phi Cassiopeiae |
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Star |
Phi Cassiopeiae (φ Cas, φ Cassiopeiae) is a star in the constellation Cassiopeia. φ Cassiopeiae is a yellow-white F-type supergiant with an apparent magnitude of +4.95. It is approximately 2300 light years from Earth. It appears among the stars of...
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| x 1 Aurigae | Star |
1 Aurigae is the original name for a star now in the constellation Perseus. It was the first entry in John Flamsteed's catalogue of stars in Auriga. When Eugène Joseph Delporte drew up simplified boundaries for the constellations on behalf of the...
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| x Mu-1 Cancri | Star |
Mu¹ Cancri (μ¹ Cnc, μ¹ Cancri) is a red giant star approximately 561 light-years away from the Solar System, in the constellation Cancer. The name Mu¹ comes from the Bayer naming system: the "1" in the name is because (from Earth) it appears to be...
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| x Van Maanen's star | Star |
Van Maanen's star (van Maanen 2) is a white dwarf star. Out of the white dwarfs known, it is the third closest to the Sun, after Sirius B and Procyon B, in that order, and the closest known solitary white dwarf. Discovered in 1917 by Adriaan van...
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| x Alpha Ursae Majoris |
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Star |
Alpha Ursae Majoris (α UMa, α Ursae Majoris) is the second-brightest star in the constellation of Ursa Major (despite its Bayer designation of "alpha"). It has the traditional name Dubhe, and a rarer name Ak. The traditional name comes from the...
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| x Regulus |
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Star |
Regulus (α Leo, α Leonis, Alpha Leonis) is the brightest star in the constellation Leo and one of the brightest stars in the night sky, lying approximately 77.5 light years from Earth. Regulus is a multiple star system composed of four stars that...
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| x Wolf 424 | Star |
Wolf 424 is a binary star system comprising two red dwarf stars at a distance of approximately 14.2 light years from the Sun. It is located in the constellation Virgo, between the stars ε Virginis and δ Virginis.
The close binary nature of this star...
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| x Epsilon Centauri | Star |
Epsilon Centauri (ε Cen, ε Centauri) is a star in the southern constellation of Centaurus. It is one of the brightest stars in the constellation with an apparent visual magnitude of +2.34. Parallax measurements put it at a distance of around 430...
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| x Altair |
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Star |
Altair (Alpha Aquilae, Alpha Aql, α Aquilae, α Aql, Atair) is the brightest star in the constellation Aquila and the twelfth brightest star in the night sky. It is an A-type main sequence star with an apparent visual magnitude of 0.77 and is one of...
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| x Gamma Cygni |
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Star |
Gamma Cygni (γ Cyg, γ Cygni) is a star in the northern constellation Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It has the traditional name Sadr (also spelled Sadir or Sador), which name comes from the...
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| x M Centauri | Star |
M Centauri (M Cen) is a binary star in the constellation Centaurus. It is approximately 257 light years from Earth.
M Centauri is a yellow G-type giant with an apparent magnitude of +4.64. It is a spectroscopic binary with an orbital period of 437...
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| x Epsilon Carinae |
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Star |
Epsilon Carinae (ε Car, ε Carinae) is a star in the southern constellation of Carina. It is also known by the name Avior. At apparent magnitude +1.86 it is one of the brightest stars in the night sky, but is not visible from the northern hemisphere....
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| x Gamma Centauri | Star |
Gamma Centauri (γ Cen, γ Centauri) is a star in the southern constellation Centaurus. It has the proper name Muhlifain, not to be confused with Muliphein, which is γ Canis Majoris; both names derive from the same Arabic root.
Gamma Centauri is a...
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| x AB Doradus | Star |
AB Doradus is a pre-main sequence trinary star system in the constellation Dorado. The primary is a flare star that shows periodic increases in activity.
The primary star in this system spins at a rate 50 times that of the Sun, and consequently has...
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| x Iota Carinae | Star |
Iota Carinae (ι Car, ι Carinae) is a star in the southern circumpolar constellation of Carina. With an apparent visual magnitude of 2.2, it is one of the brighter stars in the night sky. It can be seen from the latitude of New York and southward....
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| x Sirius |
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Star |
Sirius is the brightest star in the night sky. With a visual apparent magnitude of −1.46, it is almost twice as bright as Canopus, the next brightest star. The name "Sirius" is derived from the Ancient Greek: Σείριος Seirios ("glowing" or "scorcher"...
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| x HD 111968 | Star |
HD 111968, also known by the Bayer designation n Centauri (n Cen), is a star in the constellation Centaurus.
n Centauri is a white A-type giant with an apparent magnitude of +4.25. It is approximately 155.1 light years from Earth.
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| x Zeta Trianguli Australis | Star |
Zeta Trianguli Australis (ζ TrA) is a spectroscopic binary in the constellation Triangulum Australe. It is approximately 39.5 light years from Earth.
The system is composed of two main sequence stars, one a yellow-white F-type dwarf and the other a...
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| x Eta Centauri | Star |
Eta Centauri (η Cen, η Centauri) is a star in the southern constellation of Centaurus. It has an apparent visual magnitude of +2.35 and is located at a distance of around 306 light-years (94 parsecs). In traditional Chinese astronomy, Eta Centauri...
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