Across
- 4. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
- 6. an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
- 9. a period of twenty-four hours as a unit of time, reckoned from one midnight to the next, corresponding to a rotation of the earth on its axis.
- 10. the period of darkness in each twenty-four hours; the time from sunset to sunrise
Down
- 1. the natural agent that stimulates sight and makes things visible.
- 2. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
- 3. a continuous area or expanse which is free, available, or unoccupied.
- 4. is the star at the center of the Solar System
- 5. is the brightest and largest object in our night sky
- 7. the region of the atmosphere and outer space seen from the earth.
- 8. the planet on which we live
- 11. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.