Across 2 The 4th largest of Jupiter's satellites; covered with a smooth shell of frozen water (6) 5 Any celestial body visible (as a point of light) from the Earth at night (4) 6 The closest of Jupiter's moons; has active volcanoes (2) 7 An extremely bright star of very large diameter and low density (10) 9 (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed (4) 11 An immense cloud of gas (mainly hydrogen) and dust in interstellar space (6) 12 The natural satellite of the Earth (4) 13 Stony or metallic object that is the remains of a meteoroid that has reached the earth's surface (9) 14 The abode of mortals (as contrasted with heaven or hell) (5) Down 1 Move backward in an orbit, of celestial bodies (10) 3 A constellation on the equator

east of Taurus; contains Betelgeuse and Rigel (5) 4 The second smallest planet and the farthest known from the sun; has the most elliptical orbit of all the planets (5) 7 Any star around which a planetary system evolves (3) 8 A state or condition markedly different from the norm (10) 9 (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit (5) 10 active galactic nuclei (abbreviation). A class of galaxies which spew massive amounts of energy from their centers, far more than ordinary galaxies. Many astronomers believe supermassive black holes may lie at the center of these galaxies and power their explosive energy output. (3)