1.   Early astronomers did not have telescopes to assist their observations, but nevertheless they had a full knowledge of the skies.

2.   Amateur astronomers have a strange relationship with light.

3.   Although they do not actually fly the planes, the astronomers have had to go through some flight training, including learning how to eject.

4.   And several astronomers have proposed methods that might detect distant Earths using new ground-based telescopes.

5.   Astronomers have not had the opportunity to scrutinize them with the same diligence they will apply to the observations that follow.

6.   Astronomers have some bad news and some worse news about the possibility of Earth being walloped by an incoming comet.

7.   Astronomers have plenty of time to get ready, but many will not be alive to observe it.

8.   Astronomers have a much different sense of time than the rest of us.

9.   Astronomers have had a hard time finding that much matter in the heavens, but the larger halos may mean that all the matter has now been accounted for.

10.   Astronomers have no inkling what it is.