| 1 | | (astronomy) the luminous cloud of
particles surrounding the frozen
nucleus of a comet; forms as the
comet approaches the sun and is
warmed (4) |
| 5 | | (astronomy) a relatively small
extraterrestrial body consisting
of a frozen mass that travels
around the sun in a highly
elliptical orbit (5) |
| 9 | | A star cluster in the
constellation Taurus. (Greek
mythology) 7 daughters of Atlas
and half-sisters of the Hyades;
placed among the stars to save
them from the pursuit of Orion (8) |
| 12 | | Any star around which a planetary
system evolves (3) |
| 14 | | Any of the celestial bodies (other
than comets or satellites) that
revolve around the sun in the
solar system (6) |
| 15 | | The abode of mortals (as
contrasted with heaven or hell) (5) |
| 16 | | The (usually elliptical) path
described by one celestial body in
its revolution about another (5) |
| 17 | | A starlike object that may send
out radio waves and other forms of
energy; large red shifts imply
enormous recession velocities (6) |
| 19 | | The comet discovered by Edmund
Halley, the English astronomer who
used Newton's laws of motion to predict the period of a comet (1656-1742)SETI (7,5) |
| 20 | | The international scientific
organisation searching for extra
terrestrial life using radio
telescopes (4) |
| 22 | | A diffuse mass of interstellar
dust or gas or both, visible as
luminous patches or areas of
darkness depending on the way the
mass absorbs or reflects incident
radiation. (7) |
| 23 | | The closest of Jupiter's moons; has active volcanoes (2) |
