31.   The primary constituent of the thin Martian atmosphere now is carbon dioxide.

32.   The orbiter, which was to have relayed data from the Polar Lander, burned up in the Martian atmosphere.

33.   The ship flew just a hair too close and disintegrated in the Martian atmosphere.

34.   The spacecraft either broke up in the thin Martian atmosphere or skipped off into a useless orbit around the sun.

35.   The Swiss inventors say their ultra-light rolling robots, propelled only by the wind, could help complete models of the Martian atmosphere.

36.   The wide-angle camera will be used for daily global pictures of the Martian atmosphere and surface.

37.   These were microprobes, hitchhikers that will be fired from the lander just before it enters the Martian atmosphere.

38.   They are to be deployed about five minutes before the spacecraft enters the Martian atmosphere and should land in the same target region.

39.   Through a chemical reaction process, the hydrogen and carbon dioxide gas in the Martian atmosphere would be mixed to produce liquid methane and oxygen for rocket propellant.