1. Do you know when the first artificial satellite of America was launched?

2. The orbit of the artificial satellite has an apogee of 200 miles from the earth.

3. An artificial satellite is in the Keplerian orbit of co-rotation above the Earth's equator.

4. Artificial satellites and space probes have contributed much new knowledge.

5. The artificial satellite was launched into orbit.

6. Last week. scientists launched the third artificial satellite.

7. Do you know when the first artificial satellite was launched?

8. The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.

9. The first artificial satellite was fired off on October 4, 1957.

10. The first artificial satellite.

11. Developed degree looking at Chinese everywhere from artificial satellite photograph!

12. America's first artificial satellite called " Explorers on the 1 st. "

13. The rocket climbs upward and onward, with an artificial satellite cradled in its nose cone.

14. Rocket propellant has barely changed in the more than 50 years since the launch of the first artificial satellite Sputnik.

15. Accoding to this and the needs of real use on the artificial satellite, a kind of new sun sensor is designed based on CCD, alone with the error calibration and eliminate disturbance research.