1700040680
1700040681
Human Exploration Research Analog(HERA),45-47,226
1700040682
1700040683
Human Health and Performance Directorate,NASA,96
1700040684
1700040685
Human Outer Planets Exploration(HOPE),318
1700040686
1700040687
Huygens mission,321
1700040688
1700040689
hydrazine,104
1700040690
1700040691
hydroponics,36,195-198,260-261
1700040692
1700040693
hypercapnia,95
1700040694
1700040695
Hypersonic Airplane Space Tether Orbital Launch(HASTOL)system,140-142
1700040696
1700040697
hypoxia,95
1700040698
1700040699
Iapetus,319-320
1700040700
1700040701
IceCube Neutrino Observatory,33
1700040702
1700040703
Ice Home,253-255
1700040704
1700040705
IKAROS spacecraft,340
1700040706
1700040707
immunodeficiency,93,96
1700040708
1700040709
inflatable habitats,77,125-126,129,176-177,253,255
1700040710
1700040711
InSight probe,239
1700040712
1700040713
in situ resource utilization(ISRU),185,228-230
1700040714
1700040715
intergalactic highway,336
1700040716
1700040717
International Geophysical Year,149
1700040718
1700040719
International Space Station(ISS):cost of,10,290;microgravity research on,66-69,75;modules attached to,76-77;orbit of,26;origin of,120-121;tourism and,124-126,128
1700040720
1700040721
interstellar ark,337
1700040722
1700040723
Io,315-316
1700040724
1700040725
ionizing radiation,79-81
1700040726
1700040727
ion propulsion,207-208,338-339
1700040728
1700040729
iron,163,169-170,331
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