300 billlion years
It would take 65 years 11 months to travel to Aldebaran from Earth traversing at the speed of light.
Seeing as how we humans live on earth, I am not sure what you mean.
If light rays did not travel through space there would be no way for them to reach Earth.
Well Earth is part of the Universe and one can travel round Earth by walking. To travel to parts of our own solar system one would need a space ship. As far as we know it would take more than a human lifetime to travel to the nearest star to the Sun.
Light waves do not require a medium through which to travel. They will travel (propagate) perfectly well in a vacuum. Otherwise, light would not pass through the vacuum of space. It would be very dark here on earth as the light from the sun, moon and stars could not reach Earth through the vacuum of space.
Light can travel once around the earth in .00013358 seconds.
From where ? ? ? From the sun: 12min 40sec From the earth when Mars is closest: 4min 21sec From the earth when Mars is farthest: 20min 59sec
1 second
It would take about 22.5 minutes.
It would take about 496 seconds to travel to the sun at the speed of light.
Sunlight takes 8.4 minutes to travel 93 million miles to Earth. It would take us that long to reach the Sun at light speed.
A "light year" is a measure of distance, derived from "how far light can travel in one Earth year". Thus, if you shine a torch for the amount of time it takes the Earth to orbit the sun exactly once, that light would have travelled the distance of a "light year".