1.   It is, in a sense, a whole new planet.

2.   It would be advisable to build in at the planning stage something which would create a need for co-operation on the new planet.

3.   And each level of the game brings about a unique new planet with a unique look and original characteristics.

4.   Astronomers announced that they had detected two new planets outside our solar system.

5.   Besides, there have been announcements made before heralding the discovery of new planets.

6.   A new planet is found.

7.   But given the relative permanence of star positions, Tombaugh had no doubt that he had found a new planet.

8.   Excitement about the prospects of finding new planets has risen with three recent discoveries.

9.   From such a huge selection of possibilities, the first hints of new planets could come quickly, perhaps within weeks of the start of operations.

10.   He continued to search for new planets in the solar system, but neither he nor anyone else has found another one.