1.   Additional images are expected to come from a new orbiting Mars Surveyor craft due to be launched next April.

2.   Russian Mission Control said Tuesday it had lost radio contact with the unmanned Mir space station, signaling new troubles for the accident-prone orbiting craft.

3.   The announcement is based on an analysis of radar tracking by a military agency that monitors orbiting craft, NASA said in an announcement.

4.   The TDRS network links ground controllers with Discovery as well as other orbiting craft such as the Hubble Space Telescope.