My Favorite Nebula (in Infrared)
Courtesy of Hubble, The Horsehead Nebula in Orion.
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Fireball in Chelyabinsk
Slate has videos linked No pictures here on my blog, but the videos are amazing--you could call it "dashcam astronomy." I'm sure Slate and other news sites will be updating.Here is some speculation from my astro artist friends about determining the size and energy of the meteorite, which blew out a LOT of windows from the shockwave: How does one ascertain the size of something that has broken into pieces and burned? Was it air traffic or defense radar, or based upon the net effect of the blast? Pat: No idea how the estimate was derived!(note:"the size of a bus") A cumulation of effects, ranging from the brightness, the size of the shock wave, (the reports I am hearing on the radio this morning are saying nearly a thousand people have been injured from broken glass caused by that shock wave) would be my guess. I doubt there is a way to know definitively. From Dan: There is a system of US DoD satellit...