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Oct
30
comment Why can I turn light red or blue by holding my finger up to it?
You said an eye, but just to verify, you can see this with other eye closed?
Oct
21
accepted Speed of light in zero-index material or similar
Oct
20
awarded  Commentator
Oct
20
comment Speed of light in zero-index material or similar
So, if my light source is two flashlights, one pointing to vacuum and one zero-index material. After a second, has the light of the flashlight travelled further in zero-index material and would it be observable by receiver?
Oct
19
asked Speed of light in zero-index material or similar
Apr
1
awarded  Editor
Oct
27
awarded  Popular Question
Mar
24
comment Many times speed of light
Thanks for possible duplicate links, seems to me that this has been answered already.
Mar
24
comment Many times speed of light
You mean recessional velocity?
Mar
24
asked Many times speed of light
Nov
18
awarded  Student
Nov
17
awarded  Scholar
Nov
17
accepted Is 2.5x speed of light possible between two objects?
Nov
17
comment Is 2.5x speed of light possible between two objects?
@Chris So in observable universe the recessional velocity of a bit more than 3c may be possible to measure between 2 objects? Higher "speeds" are "possible", but they are not part of the observable universe and therefore go to the tooth fairy category, correct?
Nov
16
comment Is 2.5x speed of light possible between two objects?
Even if I have a road where 2 cars are stationary, but the road itself is enlarging and therefore making cars get further from my standpoint, I would still contrive the speed between cars to be relative to me, not based on the odometer that shows 0 in a car.
Nov
16
comment Is 2.5x speed of light possible between two objects?
I think the formula you gave only assumes observable speed between those 2 objects fired in opposite direction looked from object A to object B. But if there is an observer in the middle, he can conclude that the total length traveled is 2 times the speed of light, correct?
Nov
16
comment Is 2.5x speed of light possible between two objects?
Wikipedia: "Recessional velocity is the rate at which an object is moving away" <- For me this counts as a speed, atleast in layman terms. I don't mind whether there have to be "observers" in the middle to get the calculation.
Nov
16
asked Is 2.5x speed of light possible between two objects?