I can't comprehend this: 10 light years away there is an explosion. 10 years later we see it. But, what about the hazardous rays (like gamma or something)? When it took us 10 years to see the explosion, in the meantime negative effect is already here, so we don't actually see the process of exploding (+10 years until incoming wave arrive since the event), but whole image at once (beginning of explosion and incoming ray in the same time)? So if something happens in deep space, we don't have time, because the moment we see something happened the consequences are already here? Because they were already coming, while we were waiting for any images in the first place! Or does it works differently? What actually happens?
Explain like I'm 5 (or 10, but not more, because science classes were too much for me since middle school, so don't even try any formulas :P).
Bonus question: If the Universe expands, doesn't that 10 years travel of light stretch in the meantime (if expanding is faster than speed of light it should never reach us!?) to 10,0(+whatever 0 it takes)1 years?