Across
- 3. a group of stars that form a pattern in the sky
- 7. a spacecraft that drops into a planet's atmosphere
- 8. an imaginary line that runs through the center that the Earth rotates on
- 9. the sun, the planets and various smaller bodies
- 10. dark areas on the moon
- 13. the darkest part of the shadow
- 15. the path of an object in space as it moves around another object because of gravity
- 16. a craft designed to land on a planets surface
- 20. the second step in space exploration
- 21. a satellite in which people can live and work for long periods of time
Down
- 1. visible light that travels across distances as certain types of waves
- 2. the spreading cone of lighter shadow
- 4. an object that orbits a more massive object
- 5. a device that gathers electromagnetic radiation and makes stars or far away object look closer
- 6. everything put together in one including space and all of the matter and energy put together
- 9. range of colors that are visible when a beam of white light hits them
- 11. when a shadow makes the sun or the moon seem to grow darker
- 12. when the area of sunlight is at a maximum in one hemisphere then the other
- 14. the first stage in space exploration
- 17. when the sunlight shines equally on the northern and and southern hemispheres
- 18. patterns of temperature changes and other weather trends over the course of a year
- 19. group of millions or billions of stars held together by their own gravity