Worlds of David Darling
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J-1 (Japanese rocket)
J-2 (American rocket engine)
Jacobi, Karl Gustav Jacob (1804–1851)
Jacquard, Joseph Marie (1752–1834)
Jacob, François (1920–)
jade
James, William (1842–1910)
James Clerk Maxwell Telescope (JCMT)
James Webb Space Telescope (JWST)
jansky (Jy)
Jansky, Karl Guthe (1905–1950)
Janssen, (Pierre) Jules César (1824–1907)
Janus
JAPAN IN SPACE
JAPANESE LAUNCH VEHICLES
Japanese satellite names
JAPANESE SPACECRAFT
JAS (Japanese Amateur Satellite)
Jason (satellite series)
jasper
Jastrow, Robert (1925–2008)
jaundice
jaw
JAWSAT
JAXA (Japan Aerospace Exploration Agency)
Jeans, James Hopwood (1877–1946)
Jeans length
Jeans-Jeffreys tidal hypothesis
Jefferson, Thomas (1743–1826)
Jeffreys, Harold (1891–1989)
jejunum
jellyfish
Jemison, Mae C. (1956–)
Jenner, Edward (1749–1823)
JERS (Japanese Earth Resources Satellite)
jet (astrophysical)
jet engine
Jet Propulsion Laboratory (JPL)
jet steering
jet stream
jetavator
Jewel Box (NGC 4755)
Jikiken
Jilin meteorite
JIMO
Jindai (a.k.a. MABES)
Jiuquan Satellite Lunch Center
Jodrell Bank Observatory
John C. Stennis Space Center
John F. Kennedy Space Center
John H. Glenn Research Center at Lewis Field
Johnson, Clarence L. (Kelly) (1910–1990)
Johnson solid
Johnson Space Center (JSC)
Johnsville Centrifuge
joint (anatomy)
joint (geology)
Joint Astronomy Centre (JAC)
joint stability
jökulhlaup
Joliot-Curie, Irène (1897–1956)
Jordan, (Marie-Ennemond) Camille (1838–1922)
Josephson, Brian David (1940–1995)
joule (unit)
Joule, James Prescott (1818–1889)
Joule's laws
Joule-Thomson effect
jovian
Joy, Alfred Harrison (1883–1973)
JPL
JSC
jugular foramen
jugular vein
Julia set
Julian calendar
Julian date (JD)
Julian epoch
Juliet
Jumpseat
Jung, Carl Gustav (1875–1961)
Juno (minor planet 3)
Juno (rocket)
Jupiter
Jupiter (rocket)
Jupiter Icy Moons Orbiter (JIMO)
Jupiter, life
Jupiter, moons
Jupiter, rings
Jupiter-type comet
Jurassic period
juvenile hormone