1.   Although the exchanged particles are virtual, they certainly do produce a measurable effect-they make the earth orbit the sun!

2.   Instead of venturing onward to Mars, astronauts now cling close to home, working only in earth orbit.

3.   North Korea maintains that the launching was intended to propel a small satellite into low earth orbit.

4.   Now the United States and several other nations are building a space station that will also be put into low earth orbit.

5.   The project required launching a nuclear warhead into an earth orbit.

6.   In an apparent denial of a ballistic missile launch this week, North Korea on Friday said it has successfully fired its first artificial satellite into earth orbit.

7.   It would be based on engines developed by Energomash and would be capable of lifting payloads of up to a ton into low earth orbit.

8.   North Korea on Friday said it has successfully launched its first artificial satellite into earth orbit.

9.   Thailand has successfully launched its third communications satellite into earth orbit, Radio Thailand reported Friday.

10.   The ruling communist party newspaper, Rodong Sinmun, described the launch vehicle as a three-stage rocket that lofted a scientific satellite into earth orbit.