Across
- 3. the force of attraction by which terrestrial bodies tend to fall toward the center of the earth
- 5. The science that deals with the material universe beyond the earth's atmosphere
- 6. Having or representing the earth as a center
- 8. the point in the orbit of a planet or comet at which it is nearest to the sun
- 9. the standard unit of force in the International System of Units (SI), equal to the force that produces an acceleration of one meter per second per second on a mass of one kilogram
- 11. of or pertaining to the sun
- 12. Measured or considered as being seen from the center of the sun
- 15. a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: ( x 2 / a 2 ) + ( y 2 / b 2 ) = 1. If a = b
- 17. a crater in the second quadrant of the face of the moon having an extensive ray system
Down
- 1. the movement or path of the earth or a heavenly body turning on its axis
- 2. the point in the orbit of a heavenly body, especially the moon, or of a man-made satellite at which it is farthest from the earth
- 4. moving in an orbit in the direction opposite to that of the earth in its revolution around the sun
- 5. Unit a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles
- 7. the earth's natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2160 miles (3476 km)
- 8. the slow, conical motion of the earth's axis of rotation, caused by the gravitational attraction of the sun and moon, and, to a smaller extent, of the planets, on the equatorial bulge of the earth
- 10. the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93 million miles (150 million km), its diameter about 864,000 miles (1.4 million km), and its mass about 330,000 times that of the earth; its period of surface rotation is about 26 days at its equator but longer at higher latitudes
- 13. the obscuration of the light of the moon by the intervention of the earth between it and the sun or the obscuration of the light of the sun by the intervention of the moon between it and a point on the earth
- 14. the planet fifth in order from the sun, having an equatorial diameter of 88,729 miles (142,796 km), a mean distance from the sun of 483.6 million miles (778.3 million km), a period of revolution of 11.86 years, and at least 14 moons. It is the largest planet in the solar system
- 16. the planet third in order from the sun, having an equatorial diameter of 7926 miles (12,755 km) and a polar diameter of 7900 miles (12,714 km), a mean distance from the sun of 92.9 million miles (149.6 million km), and a period of revolution of 365.26 days, and having one satellite
- 18. any of the eight large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, or Neptune, in the order of their proximity to the sun