1.   Astronomers know that Pluto and Triton have nearly the same size, mass, and density.

2.   As far as astronomers know, the stars observed to have single planets may well have many others that have eluded detection.

3.   Astronomers know it is there because their dish-shaped radio telescopes can see through the clouds.

4.   Astronomers thus knew where to look for any object in the region that could be the source of the blast.

5.   Astronomers too should know the frustration of telling screamers in their club meeting that truth is not something that can be altered by putsch.

6.   Astronomers know that is not the case.

7.   Astronomers know that the dark matter, whatever it may be, has to be there because of the way its gravitational pull affects visible things nearby.

8.   Astronomers now know that not even the constellations represent any meaningful order.

9.   Astronomers looking skyward know that some of the most violent, calamitous occurrences in the universe are happening all around, but no one can see them.

10.   Astronomers had known for more than two years that there was something there tugging on the star, but the observations were puzzling.