Can somebody help me out here.
The gravity of a black hole is so strong that nothing can escape it, not even light. If that's the case, why can't another black hole of larger mass be used to extract information from the first black hole? Sort of like how a Siphon works. I imagine some sort...
Viewing an object with the naked eye at near light speeds
Suppose there was a hypothetical alien craft whizzing around the Earth at near light speeds. Would we be able to see a blur of it wooshing across the sky? Perhaps if it was rather large, like city size (think independence day)? Or...