Sirius, comets, Neil deGrasse Tyson, Edgar Allan Poe. All in one post.

I'm not a good astronomer, only able to pick out a few constellations or individual stars. But Sirius is probably the one star I'd know just by looking at it even without Orion nearby to point the way. All stars twinkle, but Sirius glitters and flashes--red! blue! yellow! white! full spectrum! I stared at it a while last night, and when I pointed it out to my husband and said it could easily be mistaken for a plane due to its brightness and flashiness, he peered at it and said, "No, that *has...