11.   Astronomers have yet to agree on a sharp definition of superclusters and are only beginning to develop a clear mental picture of them.

12.   Astronomers have yet to determine if there is an Earth-size planet in this system.

13.   At the moment astronomers have no way of judging distances accurately.

14.   Between the alpha and the omega, astronomers have a lot to figure out.

15.   After a few years, Borucki said, astronomers should have a good estimate of just how common Earthlike planets might be.

16.   After this fiscal year, the Arecibo radar astronomers will have to submit proposals to the agency and compete with other proposals for funding, Savage said.

17.   But that is not the only telltale frequency that astronomers had a chance see in the Rossi satellite data.

18.   Even hysterically excited astronomers have to protect their power supplies.

19.   In the few days astronomers have had to analyze the Hubble pictures, they struggled to understand details of what they were seeing.

20.   It meant that astronomers had a way to go to reach the time of galactic genesis, the frontier to the dark age.