Starship Asterisk*

Without having studied the topic in any detail, I would guess that a prominent theory of the formation of these types of clouds would refer to their formation in areas far from forces that would disperse them, that would break them up. If there is stellar wind blowing and photon pressure from many d...

I wonder to what extent have the trajectories of satellite galaxies been mapped, so that the time since the most recent passage through the plane of the Milky Way can be compared to the age of the youngest stars in those galaxies. If it were possible to make maps accurate enough (or if some satellit...

Yes, iajomac, it does say that an evening crescent was photographed last week. But last week the moon was a waning crescent, visible in the predawn sky. And a fatter crescent than we see here, too, even late in the week. Waning gibbous earlier in the week. Maybe we will see some edits soon.

Rob, since we are not particularly familiar with natural phenomena at these energies, I would suggest that what is expected and what might actually happen may not match closely.

If a miniature black hole were produced by a curious species involved in high-energy physics experiments, and that black hole ended up swallowing the planet that was home to such species, what kind of signature would such an implosion produce?