Across
- 2. System / the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
- 3. / The word crescent refers to the phases where the moon is less than half illuminated.
- 5. / the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
- 6. / celestial bodies moving in an elliptical orbit round a star.
- 10. / An imaginary straight line passing through the North Pole, the center of the Earth, and the South Pole.
- 13. / great circle on the celestial sphere representing the sun's apparent path during the year, so called because lunar and solar eclipses can only occur when the moon crosses it.
- 15. / a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
- 20. Moon / part way between a half moon and a new moon, or between a new moon and a half moon.
- 21. / the partially shaded outer region of the shadow cast by an opaque object.
- 23. / of, determined by, or resembling the moon.
- 25. / the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
- 26. / all existing matter and space considered as a whole; the cosmos.
- 27. / a distinct period or stage in a process of change or forming part of something's development.
- 28. / Standard Time
- 30. Moon / the phase of the moon in which its whole disc is illuminated.
- 32. / each of the four divisions of the year
- 34. / the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about 22 September and 20 March).
- 35. / the warmest season of the year, in the northern hemisphere from June to August and in the southern hemisphere from December to February.
- 36. Moon / the phase of the moon when it first appears as a slender crescent, shortly after its conjunction with the sun.
Down
- 1. / The word crescent refers to the phases where the moon is less than half illuminated.
- 3. / the coldest season of the year, in the northern hemisphere from December to February and in the southern hemisphere from June to August.
- 4. / the line at which the earth's surface and the sky appear to meet.
- 7. / either of the two times in the year when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.
- 8. / the action of rotating about an axis or center.
- 9. / a forcible overthrow of a government or social order, in favor of a new system.
- 11. / a group of similar things or people positioned or occurring closely together.
- 12. / the great size or extent of something.
- 14. / More than half but less than fully illuminated
- 15. / an artificial body placed in orbit round the earth or another planet in order to collect information or for communication.
- 16. / the season after summer and before winter, in the northern hemisphere from September to November and in the southern hemisphere from March to May.
- 17. / the planet on which we live; the world.
- 18. / a small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.
- 19. / the star round which the earth orbits.
- 22. / the proportion of the incident light or radiation that is reflected by a surface, typically that of a planet or moon.
- 24. / the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
- 29. / an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
- 31. / the regularly repeated elliptical course of a celestial object or spacecraft about a star or planet.
- 32. / the season after winter and before summer, in which vegetation begins to appear, in the northern hemisphere from March to May and in the southern hemisphere from September to November.
- 33. / a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.