index 249 helium, 232 Herbig, George, 25 Herbig- Haro objects, 25 Herschel, John, 204 Herschel, William, 8, 17­19, 47­48 Hewish, Anthony, 61 Hitchhiker'sGuidetotheGalaxy (Adams), 53 hoaxes, 204­6 Hobby-Eberly Telescope, 117 Hodierna, Giovanni Batista, 17 Holland, Wayne, 36 Holmberg, Erik, 50 Hooker 100-inch telescope, 169 Horne, Keith, 111 Horrocks, Jeremiah, 104 Horsehead Nebula, 18 hot Jupiters, 76, 79, 85, 88­89, 92, 112, 116­18, 120n1, 143, 199, 232; transits of, 198 interferometer, 233 interferometry, 168­70, 233; infra- red, 170; optical, 169­70 Io, 184 iodine, 59 isolated planetary mass object. See planetary mass object isotopes, 233 Jacob, Capt. W. S., 49 James Webb Space Telescope, 121, 165, 225 Jeans, James, 6, 21 Jewett, David, 125 Johansen, Anders, 30 Johnson, John, 92 Jupiter, 50­51, 123; building blocks of, 42; Great Red Spot, 129; moons of, 3. Seealso hot Jupiters