Astronomers using NASA's Hubble Space Telescope stumbled upon a mysterious object that grudgingly yielded clues to its identity. The object is classified as a planetary nebula, the glowing remains of a dying, lightweight star.
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Mysterious Object He2-90

Astronomers using NASA's Hubble Space Telescope have stumbled upon a mysterious object that is grudgingly yielding clues to its identity. A quick glance at the Hubble picture at top shows that this celestial body, called He2-90, looks like a young, dust-enshrouded star with narrow jets of material streaming from each side. But it's not. The object is classified as a planetary nebula, the glowing remains of a dying, lightweight star. But the Hubble observations suggest that it may not fit that classification, either. The Hubble astronomers now suspect that this enigmatic object may actually be a pair of aging stars masquerading as a single youngster. One member of the duo is a bloated red giant star shedding matter from its outer layers. This matter is then gravitationally captured in a rotating, pancake-shaped accretion disk around a compact partner, which is most likely a young white dwarf (the collapsed remnant of a sun-like star). The stars cannot be seen in the Hubble images because a lane of dust obscures them. The image can be viewed at http://hubblesite.org/newscenter/archive/releases/2000/24/image/a/.

Image details

ID#:
PIA04214

Date added:
1999-12-01

Target:
mysterious object

Mission:
Hubble Space Telescope (HST)

Spacecraft:
Hubble Space Telescope

Instruments:
Wide Field Planetary Camera 2

Rating:



Views:
4,891

Full-Res TIFF:
PIA04214.tif (6.58 MB)

Full-Res JPG:
PIA04214.jpg (0.49 MB)

Image credit:
NASA, Raghvendra Sahai (NASA Jet Propulsion Laboratory, Lars-Ake Nyman (European Southern Observatory Chile & Onsala Space Observatory, Sweden