Hubble, Edwin P., 52, 102, 105, 145
Hubble Space Telescope, 129, 174
human nature, 45, 197–201
hunger, 195
hurricanes, 180
Hyakutake (comet), 170
hydrogen, 27, 36, 74, 83, 117–18, 203
hydrogen bomb tests, 127
hydrogen clouds, 71
ice floes, 180
infrared light, 150, 151, 185
infrared telescopes, 163
intelligence, 199–201
interferometer, 158–60
intergalatic space, 62–74
International Space Station, 178–79
interplanetary space, 165–77
Io (moon), 172
iridium, 126–27
iron, 36, 124, 166
Jansky, Karl G., 155–56, 157
Jodrell Bank Observatory, 158
Johns Hopkins University, 103
Joyce, James, 22
Jupiter (god), 129
Jupiter (planet), 42–43, 117, 128, 129, 168, 174, 176
gravitational field of, 176
magnetic field of, 170
moons of, 172
as radio wave source, 185
Kepler telescope, 183–84
Kitt Peak National Observatory, 122
Kuiper, Gerard, 169
Kuiper belt, 131–32, 169–70
Kuwait, 179
lambda, 99–100, 102–3, 104, 106, 111, 112–13
Large Hadron Collider, 25
Laser Interferometer Gravitational-Wave Observatory (LIGO), 96n
Lawrence Berkeley National Laboratory, 105
LED bulbs, 51, 121
Leeuwenhoek, Antonie van, 150
Lemaître, Georges, 52
leptons, 21, 22, 23–25
Le Verrier, Joseph, 130
Levy, David, 177
light, speed of, 21, 40–41, 145
light, visible, 88, 147–48, 151, 152
temperature of, 148
see also electromagnetic spectrum