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They should be visible any time at night (note that longitude has little to do with observing meteors), but there are many things that could thwart your observing. Bright lights: In a big city you will see far fewer meteors. In a big enough city, you won't see any. On that note, if you keep checking a mobile device with a backlit screen, you probably won't ...

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String theory considers a 2-dimensional quantum field theory (in flat space) that contains, among other things, a set of 10 fields $\phi^\mu$, just like we consider an electric field as a group of 3 fields $E_x$, $E_y$, $E_z$. Inside this 2-dimensional quantum field theory, there are a number of consistency conditions that must be satisfied in order for the ...

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David H is correct. If someone answered "Well, space is XYZZY" then you might, understandably, scratch your head and follow-up with "But... what is XYZZY". Ultimately, as has been mentioned here numerous times, we get to the level of fundamental constituents of the world such as, for example, electric charge. When we say that electric charge is a ...

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