-
The first image is a JPEG color image. This image is fairly
small (less than 100kbytes)
-
The other images are TIFF (grey-scale). Your browser may
invoke an external viewer for these. These images are large (1 Mbytes)
-
ir2, ir3, ir4 and ir5 are taken in various infrared wavelengths.
-
vis is in the visible light, so there are dark areas at night
- or during a total eclipse of the sun.
There are many free and shareware TIFF viewers on the net,
such as 
IrfanView.
Also, check in TUCOWS or Here
for more samples.
