1.   Several theories of planetary formation include the possibility of disturbance to axial spins during the late stages of formation of a planet.

2.   We now know a lot more about the early stages of planetary formation.

3.   And since more massive stars have shorter lifespans, any planetary formation associated with them is less likely to survive long enough for life to emerge.

4.   If it is considered a planet, astronomers said, then there is much about planetary formation that scientists have yet to learn.

5.   In the early period of planetary formation, the disk would still be thick with gas and other material.

6.   The latter seems to throw all the theories of planetary formation into disarray.

7.   The processes that sustain the rings, scientists think, may provide hints of the processes responsible for planetary formation.

8.   They have nothing directly to do with planetary formation.

9.   Astronomers find evidence of planetary formation.