Captured in astounding detail by ESO’s Very Large Telescope (VLT), the eerie Skull Nebula is showcased in this new image in beautiful pink and red tones. This planetary nebula, also known as NGC 246, is the first known to be associated with a pair of closely bound stars orbited by a third outer star. Credit: THAT

This ethereal remnant of a long dead star, nestled in the belly of The Whale, bears an uneasy resemblance to a skull floating through space. Captured in astounding detail by ESO’s Very Large Telescope (VLT), the eerie Skull Nebula is showcased in this new image in beautiful bloodshot colors. This planetary nebula is the first known to be associated with a pair of closely bound stars orbited by a third outer star.

Captured in astounding detail by ESO’s Very Large Telescope (VLT), the eerie Skull Nebula is showcased in a new image in beautiful pink and red tones. This planetary nebula is the first known to be associated with a pair of closely bound stars orbited by a third outer star. This video offers stunning views of this object and tells the story of the three stars at its center. Credit: THAT

Also known as NGC 246, the Skull Nebula lies about 1600 light-years away from Earth in the southern constellation of Cetus (The Whale). It formed when a Sun-like star expelled its outer layers in its old age, leaving behind its naked core — a white dwarf — one of two stars that can be seen at the very center of NGC 246.

This video sequence starts from a wide field of the region of the sky around NGC 246, the Skull Nebula, and closes in on the planetary nebula. The final very detailed view comes from ESO’s Very Large Telescope at the Paranal Observatory in Chile. Credit: ESO/Digitized Sky Survey 2/N. Risinger (skysurvey.org). Music: Astral Electronic

Even though this nebula has been known for centuries, only in 2014 did astronomers discover, using ESO’s VLT, that the white dwarf and its companion are concealing a third star situated at the heart of the Skull Nebula. This star, which is not visible in this image, is a dim red dwarf that sits close to the white dwarf at about 500 times the distance between Earth and the Sun. The red and white dwarf stars orbit each other as a pair, and the outer star orbits the two dwarfs at a distance of around 1900 times the Earth-Sun separation. Collectively, these three stars establish NGC 246 as the first known planetary nebula with a hierarchical triple stellar system at its center.

This chart shows the location of the planetary nebula NGC 246, also known as Skull Nebula, in the constellation of Cetus (The Whale). The map includes most of the stars visible to the unaided eye under good conditions, and the location of the nebula is indicated by a red circle. Credit: THAT, IAU and Sky & Telescope

Taken by the FORS 2 instrument on ESO’s VLT in the Chilean Atacama Desert, this new image of the Skull Nebula intentionally captures light emitted in some narrow ranges of wavelengths — those associated with hydrogen and oxygen gas. Observations of light emitted by particular elements help reveal a wealth of information about an object’s chemical and structural compositions. This new image of the Skull Nebula highlights where NGC 246 is rich or poor in hydrogen (shown in red) and oxygen (depicted in light blue).

This image shows the sky around the location of NGC 246, the Skull Nebula, which is visible in blue at the very centre of the frame. This picture was created from images in the Digitized Sky Survey 2. Credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin

This image was selected as part of the ESO Cosmic Gems program, an outreach initiative to produce images of interesting, intriguing or visually attractive objects using ESO telescopes, for the purposes of education and public outreach. The program makes use of telescope time that cannot be used for science observations. All data collected may also be suitable for scientific purposes, and are made available to astronomers through ESO’s science archive.

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NGC 246, Nebula, Star, Planetary nebula, Astronomy, Very Large Telescope

World news – GB – Stars and Skulls: Eerie Nebula Revealed in Astounding Detail

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