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CoKu Tau/4 is a pre-main-sequence binary
Binary star

A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star or secondary....
 T Tauri star
T Tauri star

T Tauri stars are a class of variable stars named after their prototype ? T Tauri. They are found near molecular clouds and identified by their optical variable star and strong chromosphere lines....
 in the constellation Taurus
Taurus (constellation)

Taurus is one of the constellations of the zodiac. Its name is Latin for cattle, and its symbol is , a stylized bull's head. Taurus is a large and prominent constellation in the northern hemisphere's winter sky, between Aries to the west and Gemini to the east; to the north lie Perseus and Auriga , to the southeast Orion , to the south E...
. The stars are surrounded by a circumbinary disc with a central cavity of radius 10 astronomical unit
Astronomical unit

An astronomical unit is a unit of length based on the mean distance from the Earth to the Sun. The precise value of the AU is currently accepted as 149,597,870,691 Plus-minus sign 6 metres ....
s. Before its binary nature was known, the central cavity in the system's disc was thought to have been cleared out by a planet
Extrasolar planet

An extrasolar planet, or exoplanet, is a planet beyond the Solar System, orbiting a star other than the Sun. As of February 2009, 342 exoplanets are listed in the Extrasolar Planets Encyclopaedia....
 of at least 10 Jupiter mass
Jupiter mass

Jupiter mass is the unit of mass equal to the total mass of the planet Jupiter . Jupiter mass is used to describe masses of the gas giants, such as the outer planets and extrasolar planets....
es, a rare example of a so-called "transitional disc". This model was disproven in 2008 when the star was resolved using adaptive optics
Adaptive optics

Adaptive optics is a technology used to improve the performance of optics by reducing the effects of rapidly changing optical distortion. It is used in astronomical telescopes and laser communication systems to remove the effects of atmospheric distortion, and in retinal imaging systems to reduce the impact of ocular aberrations....
 as a system of two near-equal-mass stars with a projected separation of 8 AU. The central cavity is thus cleared out by the stars, not by the gravitational influence of a planet.

Cohen-kuhi Tau/4

 

 
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CoKu Tau/4 is a pre-main-sequence binary
Binary star

A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star or secondary....
 T Tauri star
T Tauri star

T Tauri stars are a class of variable stars named after their prototype ? T Tauri. They are found near molecular clouds and identified by their optical variable star and strong chromosphere lines....
 in the constellation Taurus
Taurus (constellation)

Taurus is one of the constellations of the zodiac. Its name is Latin for cattle, and its symbol is , a stylized bull's head. Taurus is a large and prominent constellation in the northern hemisphere's winter sky, between Aries to the west and Gemini to the east; to the north lie Perseus and Auriga , to the southeast Orion , to the south E...
. The stars are surrounded by a circumbinary disc with a central cavity of radius 10 astronomical unit
Astronomical unit

An astronomical unit is a unit of length based on the mean distance from the Earth to the Sun. The precise value of the AU is currently accepted as 149,597,870,691 Plus-minus sign 6 metres ....
s. Before its binary nature was known, the central cavity in the system's disc was thought to have been cleared out by a planet
Extrasolar planet

An extrasolar planet, or exoplanet, is a planet beyond the Solar System, orbiting a star other than the Sun. As of February 2009, 342 exoplanets are listed in the Extrasolar Planets Encyclopaedia....
 of at least 10 Jupiter mass
Jupiter mass

Jupiter mass is the unit of mass equal to the total mass of the planet Jupiter . Jupiter mass is used to describe masses of the gas giants, such as the outer planets and extrasolar planets....
es, a rare example of a so-called "transitional disc".






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Distance
Cosmic distance ladder

File:Extragalactic distance ladder.JPGThe cosmic distance ladder is the succession of methods by which astronomers determine the distances to celestial objects....
~420 ly
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Distance
Cosmic distance ladder

File:Extragalactic distance ladder.JPGThe cosmic distance ladder is the succession of methods by which astronomers determine the distances to celestial objects....
~420 ly