Chris Astronomy Crossword
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Down:
1) Half the diameter of Earth, mixture of rock and ice, heavily cratered.2) A satellite that, by its gravitational field, confines particles to a planetary ring.3) Giant ice moon with a thick atmosphere.5) The heating of a planet or satellite because of friction caused by tides.7) Larger than Mercury, over 3/4 diameter of Mars, rocky core, ice rich mantle, smaller iron core.9) Surface is dominated by nitrogen.11) Gaseous sulfur and oxygen atmosphere ions produce a cloud of sulfur and sodium ions in a torus13) Pluto's big spherical moon, dwarf planets.14) Smaller than Earth's moon, mostly rock and ice, surface is ice. |
Across:
4) The minimum distance between a planet and a satellite that holds itself together by it's own gravity. If a satellite's orbit brings it within it's planet's Roche Limit, tidal forces will pull the satellite apart. 6) The passage of an extrasolar planet across the disk of it's parent star as observed from Earth, partially blocking the light from the star and allowing detection and study of the planet.8) The flattening of a spherical body usually caused by rotation10) The passage of a larger body in front of a smaller body.12) A form of hydrogen under high pressure that is a very good electrical conductor.15) Violent past, icy mantel, heat from interior, craters. |
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