What is the slowest speed of light?

Answer 1

In the center of stars. - (previous answer)

Light has been artificially slowed to far lower speeds

Researchers at the Rowland Institute for Science slowed light to 38 miles per hour in 1999 ( http://en.wikipedia.org/wiki/Slow_light )

[ sourced from Cromie, William J. (1999-02-18). "Physicists Slow Speed of Light". The Harvard University Gazette. http://www.hno.harvard.edu/gazette/1999/02.18/light.html. Retrieved 2008-01-26. ]

so to answer the question, light has so far been shown to travel the slowest

in a Bose-Einstein condensate

though technically since a balckhole is infinitly small and can trap light, its speed in a black hole reaches zero, but then its not really traveling is it?

Answer 2

As the medium through which light propagates in space is closes to a vacuum, light propagates very well in space. However, it travels at the same speed as it would on earth, as light travels at 299,792,458m/s in a vacuum, regardless of where that vacuum is located.

Answer 3

Things that have mass require energy to go fast. Anything that has mass requires an infinite amount of energy in order to go the speed of light.

Light has no mass, so it can go the speed of light with no problem. In fact, it always goes the speed of light, unless it's going through a material other than a vacuum.

Answer 4

The answer is 38 miles per hour or 60 km per hour.

This is caused by bringing the temperature of sodium to absolute zero then passing light through it.

Answer 5

solid because thats what my science teacher said, i think its something about the waves being able to go through when there are more particles, thats why you cant hear a scream in space!

Answer 6

By changing the temperature of sodium to absolute zero

then passing light through it will make the light go at the speed of 38 miles per hour and 60 km per hour