This
image shows a composite view of the Crab nebula, an iconic supernova remnant in
our Milky Way galaxy, as viewed by the Herschel Space Observatory and the
Hubble Space Telescope. Herschel is a European Space Agency (ESA) mission with
important NASA contributions, and Hubble is a NASA mission with important ESA
contributions. A wispy and filamentary cloud of gas and dust, the Crab nebula
is the remnant of a supernova explosion that was observed by Chinese
astronomers in the year 1054. The image combines Hubble's view of the nebula at
visible wavelengths, obtained using three different filters sensitive to the
emission from oxygen and sulphur ions and is shown here in blue. Herschel's
far-infrared image reveals the emission from dust in the nebula and is shown
here in red. While studying the dust content of the Crab nebula with Herschel,
a team of astronomers have detected emission lines from argon hydride, a
molecular ion containing the noble gas argon. This is the first detection of a
noble-gas based compound in space. The Herschel image is based on data taken
with the Photoconductor Array Camera and Spectrometer (PACS) instrument at a
wavelength of 70 microns; the Hubble image is based on archival data from the
Wide Field and Planetary Camera 2 (WFPC2). Image credit: ESA/Herschel/PACS/MESS
Key Programme Supernova Remnant Team;
NASA, ESA and Allison Loll/Jeff Hester (Arizona State University)
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