This is M33 in visible light (above right). Trace the spiral arms
extending from the galaxy's core. Notice the bright clouds of dust
and gas as well as the dark dust clouds making lanes through the
arms. These are similar to features in the Milkey Way Galaxy. The
brightest cloud in M33 is 11 arc minutes from the nucleus of the
The image to the right was captured by the IRAS infrared satellite
at a wavelength of 60 microns. The image has been processed so that
the brightest areas in IR appear lightest.
Compare the two photographs. Identify the areas on the visible
light photograph above that are also bright at infrared wavelengths.
Find any areas that are bright in IR and not bright in visible light.
The white square in the corner of the photo above is the area
of the KAO telescope field at 60 microns. Based on the IR data to
the right, pick areas you would observe with the KAO. Record observations
made by KAO astronomers during their flight.