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seen Apr 16 at 9:45

Apr
1
comment Would approaching a distant star at near the speed of light unfold its entire history in “fast-forward”?
So, an observer onboard the ship sees the time slow down for the star but still sees a fast forward version of its history?? Isn't that contradictory?
Mar
27
accepted How can photons interact with anything?
Mar
26
comment How can photons interact with anything?
Ok i get from the answer that my conception of a common 4D coordinate system is wrong. So when talking about a world line, we always have a reference frame already in mind? And you say if two objects occupy the same spacetime point in one frame they do so in all frames - but how can that ever happen? And regarding light: It moves at light speed in my reference frame, so how can it move in time (in my reference frame again)?
Mar
25
asked How can photons interact with anything?
Sep
11
comment Is a total solar eclipse a common phenomenon?
that's very interesting (also nice pictures). Does that mean moons tend to orbit the planets in a way that the shadow will fall on the planet sometimes? Does this have to do with (i dont know how to express this differently) how the planets got their moons?
Sep
11
comment Is a total solar eclipse a common phenomenon?
@user6972 no i meant outside, or moons in general.
Sep
9
awarded  Scholar
Sep
9
awarded  Supporter
Sep
9
accepted Is a total solar eclipse a common phenomenon?
Sep
9
awarded  Student
Sep
9
asked Is a total solar eclipse a common phenomenon?
Mar
28
comment How long can you survive 1 million degrees?
some ion rays are even used for cancer therapy, because they actually do penetrate the skin, and transfer most of the energy only at a certain, well defined depth into the body! So yes, it entirely depends on the particles. (unlike most photons that transfer most energy to the skin) - correct me if i'm wrong, i'm only a computer scientist happening to live near a research institute that researches this kind of therapy.