Across
- 5. - the action of rotating about an axis or center.
- 6. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
- 12. - a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
- 14. hole - a region of space having a gravitational field so intense that no matter or radiation can escape.
- 16. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
- 18. - a celestial body moving in an elliptical orbit round a star.
- 22. a forcible overthrow of a government or social order, in favor of a new system
- 23. - the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about 21 June and 22 December).
- 24. - the force that attracts a body towards the center of the earth, or towards any other physical body having mass.
- 26. - the curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution
- 27. - a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
- 30. - the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length (about 22 September and 20 March).
Down
- 1. - a celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun.
- 2. a celestial body orbiting the earth or another plane
- 3. the sun's rays as a source of energy from which power for domestic or industrial use may be generated.
- 4. - a piece of rock or metal that has fallen to the earth's surface from outer space as a meteor. Over 90 per cent of meteorites are of rock while the remainder consist wholly or partly of iron and nickel.
- 7. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
- 8. planet - a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
- 9. a planet that orbits a star outside the solar system.
- 10. - a spot or patch that appears from time to time on the sun's surface, appearing dark by contrast with its surroundings.
- 11. belt - The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets
- 13. giant - a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
- 15. Belt -
- 17. - 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.
- 19. 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.
- 20. - a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).
- 21. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 25. the envelope of gasses surrounding the earth or another planet
- 28. Way - The Milky Way is the galaxy that includes the Solar System
- 29. an imaginary line about which a body rotates.