Palomar Observatory Sky Survey (POSS)
The first version of this visible light (wavelengths: 0.4 - 0.65
microns) sky survey was carried out in the 1950s on Mount Palomar
in San Diego, California. In the 1970s the U.K. Schmidt telescope
surveyed the southern sky in an identical fashion as the Palomar
telescope. The data, which were orginally taken as photographic plates,
are now combined together in the Digitized
Two Micron All-Sky Survey (2MASS)
also an all-sky survey carried out with ground-based telescopes (one
in Arizona and one in Chile). This survey studied the sky in near-infrared
1.25 - 2.17 microns), fully mapping the Milky Way and nearby Universe.
view of the entire sky (rendered in an Aitoff projection). Not produced
directly from the 2MASS sky images, this view has been compiled from
star counts in the 2MASS point source database. Each color represents
the local density of stars seen in each of the 3 infrared bands in
the survey. Almost 100 million stars appear here.
Cosmic Background Explorer (COBE)
a NASA satellite mission that mapped the entire sky in infrared
and microwave wavelengths. One of the instruments aboard, DIRBE,
surveyed the sky in the near-infrared (wavelengths: 1.25 - 3.5 microns).
sky as seen by DIRBE (rendered in Aitoff projection). As in other
such views of the sky, the image is centered on the Milky Way Galaxy.
The central bulge of the Galaxy is clearly visible in near-infrared
since such light penetrates the dust and gas that obscures our view
in the visible.
Infrared Astronomical Satellite (IRAS)
a NASA satellite mission in the 1980s that studied the Universe
in the infrared. It conducted an all-sky survey in the infrared
12 - 100 microns).
:: IRAS at the Infrared Processing and Analysis Center (IPAC)
|Nearly the entire sky, as seen in infrared wavelengths at one-half degree resolution, assembled from six months of data from IRAS. The bright horizontal band is the plane of the Milky Way, with the center of the Galaxy located at the center of the picture.