- Object is known as the ‘Crystal Ball’ nebula
- Comprises a pair of stars surrounded by gas rings
- Indicates the dying stage of a stars’ life
A new image from NASA’s Wide-field Infrared Survey Explorer shows what looks like a glowing jellyfish floating at the bottom of a dark, speckled sea.
In reality, this critter belongs to the cosmos—it’s a dying star surrounded by fluorescing gas and two very unusual rings.
“I am reminded of the jellyfish exhibition at the Monterey Bay Aquarium—beautiful things floating in water, except this one is in space,” said Edward (Ned) Wright, the principal investigator of the WISE mission at UCLA, and a co-author of a paper on the findings, reported in the Astronomical Journal.
The object, known as NGC 1514 and sometimes the ‘Crystal Ball’ nebula, belongs to a class of objects called planetary nebulae, which form when dying stars toss off their outer layers of material.
NGC 1514 is located 800 light-years away, in the direction of the constellation Taurus.
Ultraviolet light from a central star, or in this case a pair of stars, causes the gas to fluoresce with colourful light. The result is often beautiful—these objects have been referred to as the butterflies of space.
NGC 1514 was discovered in 1790 by Sir William Herschel, who noted that its “shining fluid” meant that it could not be a faint cluster of stars, as originally suspected.
Herschel had previously coined the term planetary nebulae to describe similar objects with circular, planet-like shapes. In reality they have nothing to do with planets.
Dying star’s last gasp
Planetary nebulae with asymmetrical wings of nebulosity are common. But nothing like the newfound rings around NGC 1514 had been seen before. Astronomers say the rings are made of dust ejected by the dying pair of stars at the centre of NGC 1514. This burst of dust collided with the walls of a cavity that was already cleared out by stellar winds, forming the rings.
“I just happened to look up one of my favourite objects in our WISE catalogue and was shocked to see these odd rings,” said Michael Ressler, a member of the WISE science team at NASA’s Jet Propulsion Laboratory, and lead author of the paper.
Ressler first became acquainted with the object years ago while playing around with his amateur telescope on a desert camping trip. “It’s funny how things come around full circle like this.”
WISE was able to spot the rings for the first time because their dust is being heated and glows with the infrared light that WISE can detect. In visible-light images, the rings are hidden from view, overwhelmed by the brightly fluorescing clouds of gas.
“This object has been studied for more than 200 years, but WISE shows us it still has surprises,” said Ressler.
Serendipitous findings like this one are common in survey missions like WISE, which comb through the whole sky. WISE has been surveying the sky in infrared light since January 2010, cataloguing hundreds of millions of asteroids, stars and galaxies.
In late September 2010, after covering the sky about one-and-a-half times, as planned it ran out of the frozen coolant needed to chill its longest-wavelength detectors.
The mission, now called NEOWISE, is still scanning the skies with two other of its infrared detectors, focusing primarily on comets and asteroids, including near-Earth objects, which are bodies whose orbits pass relatively close to Earth’s orbit around the sun.
The WISE science team says that more oddballs like NGC 1514 are sure to turn up in the plethora of WISE data—the first batch of which will be released to the astronomical community in spring 2011.
Adapted from information issued by NASA / JPL-Caltech / UCLA / DigitiSed Sky Survey / STScI.
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