Depends on the characteristics of the tube. Coat the interior surface with a (perfect) mirror finish, and the laser beam will continue quite happily.
Fill the tube with either multiple fiber optic strands, or build it like one huge fiber optic strand and the beam will continue as well.
It is to thin
Electromagnetic waves can travel through space without a medium.
Electromagnetic Waves can travel through space without any material medium.
sound can't travel through a vacuum. or a place without air.
The best fictional way to travel through space fast without messing with time is teleportation.
We can if we use radio. Without it, sound waves can't travel through space because there is no air for it to travel through.
no
yes
Theoretical, infinate, if you travel through warp space.
No. Sound waves must travel through a medium, such as air, liquid, or a solid.
As particles photons travel in a straight line unless they are diverted by reflection, refraction, or a magnetic or gravitational field. Note that when it comes to gravity it can also be represented that the light continues in a straight line - but the space it travels through is curved so its path appears curved to the outside observer.
It is because light can travel through space that Earth can get sunlight. Without sunlight life on Earth could not exist.