[Answer]the ranking that NASA scientists gave the 15 items

Here is the ranking that NASA scientists gave the 15 items. See if you selected the same items as the top 5 - or most important - and identified the 5 least important. Even if your ranking numbers are not the exact same ones, your knowledge of the Moon and conditions there should have helped you decide which items fell to the very top and bottom of the list.

Items below are listed in order from Number 1 ( most importnat) to Number 15 (least important).

1 - Two 100-pound tanks of oxygen. Oxygen to breathe would be the most perssing need for survival.

2 - 5 gallons of weater. Water is essential to all life.

3 - Stellar map(of moon's surface). This would be your primary means of navigation.

4 - Food concentrate. A good source of food and efficient way to carry food is in concentrated form.

5 - Solar-powered FM receiver-transmitter. FM needs short range and line of sight. Needed to talk to mother ship.

6 - 50 feet of nylon rope. This will be useful in scaling the cliffs you may cross and if their are injured it would bu helpful for tying them to others or objects for tarnsport.

7 - First aid kit containing injection needle. Used for injecting vitamins through special aperture in space suit.

8 - Parachute silk. Provides protection from sun's rays.

9 - Life laft. CO2 bottle in raft may be used for propulsion.

10 - Signal flares. Distress signal can be used when mother ship is sighted.

11 - Two 45 calibre pistols. Possible means of propulsion.

12 - One case dehydrated milk. duplication of fook concentrate but much bulkier to carry.

13 - Portable heating unit. Useless on dark side, not needed on lighted side.

14 - Magnetic compass. Magnetic field on moon is not polarized, compass worthless.

15 - Box of matches. No oxygen on Moon to sustain the flame, matches won't work