I know, I know, in the last 20 years the light speed changed from 300 cm/s to 300 million km/s… Certainly, on the news only!

Please use the proper formating (you can use some tags like …), since an attosecond is 1 divided by 1,000,000,000,000,000,000 of a second… (after mili, micro, nano, pico, femto, atto…).

Sorry. Not trying to tease but you’re missing the point. The limitation your eye may have in seeing something has nothing to do with what a given detector can detect. If so we wouldn’t know about infrared light. Can’t be detected by our eye, must not be there. The only limitation in ’seeing’ or more correctly, detecting something, is the size of the particle being used for detection (a photon - mighty small) and the sensitivity of the ’sensor plate’. If the sensor can register the impact of a single photon, it’s possible.

Even if your sensor is not sensitive enough to register a single impact it can still be used. Old photo film is a perfect example. Film is sensitive to light but you need enough light to hit the film to make it register a useful image. The reason is the ’sensor’ is actually clumps of molecules called silver salts. When enough photons hit one of these clumps it undergoes a chemical change. But it only happens when it reaches a threshold, after x number of photons hit it. These clumps are far larger than any one photon - so big you can actually see them (using photons ;) under a microscope. Your skin does the same thing by the way. Ever get a tan? It doesn’t happen the moment you step out in the sun does it? It’s this continued or repeated exposure that makes the recording possible - qoute, “By taking several pictures of exactly the same moment in the process, it’s possible to create stronger, but still sharp, images.”

At 10-18 seconds per attosecond, 150 attoseconds per revolution, that’s 25 to 45 minutes per revolution around the nucleus of an atom. Pretty slow. Maybe that’s what causes gravity.

Unless it’s supposed to be 10^(-18) second is one attosecond.