31.   If not, astronomers are making plans to double the number of near-term observations.

32.   In that case, it quickly turned out the Earth was safe after all, and astronomers have been arguing ever since about the way that report was disseminated.

33.   It is still possible that the astronomers have been victims of an optical illusion, as Hubble was with the Cepheids.

34.   It had not gone well, my answers were not very accurate and there was one astronomer who doubted I was measuring magnetic fields at all.

35.   It was considered a fizzle, and astronomers have been wary of making such predictions ever since.

36.   It must be generated by some kind of waves or magnetic energy, but astronomers had been unable to identify a sufficient source.

37.   No astronomer is ready to offer a definitive explanation, but there are several possibilities.

38.   On a smaller scale, astronomers are heavily dependent on liquid helium for cooling infrared and microwave sensors in their telescopes.

39.   Other astronomers have been more positive.

40.   Readjusting the calculations, astronomers were able to come up with a universe old enough to contain the earth.