25 Enlightening Facts About Light And Vision

Light is probably more interesting than you think. For thousands of years light was just one of those things that people knew was there, they knew it was important, but never really thought too much about it. Without light you can’t see, that’s all they knew. It wasn’t until later that people realized light is unique. In the last several hundred years scientists have discovered just how unique light really is. For one, it is unlike any other substance in the universe. That’s right, it can be defined as a substance. How can that be? It’s because light can be both a wave and a particle…at the same time! Moreover, scientists found that light always travels the same speed, even if you shine it off of a moving object. This may not be immediately obvious, but if you shoot or launch anything else off a moving object then it’s velocity will be affected by the velocity of the object you are launching it from. For example, try throwing a tennis ball out of a car window. Not only will it be moving perpendicular to your car but it will also continue moving in the direction of your vehicle as well. Light doesn’t do that. These are 25 enlightening facts about light and vision.

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25

Thanks to time dilation, a person could actually travel thousands of light years in a normal human lifespan (traveling 28 years with 1 g of constant acceleration for the first 14 years would get you to the Andromeda Galaxy 2 million light years away)

Thanks to time dilation, a person could actually travel thousands of light years in a normal human lifespan (traveling 28 years with 1 g of constant acceleration for the first 14 years would get you to the Andromeda Galaxy 2 million light years away)Source: wikipedia, Image: pixabay
24

Time dilation is what happens when you approach the speed of light. After 1 year of traveling at near light speed if you came back to Earth you would come to find that potentially hundreds of years have elapsed here!

Time dilation is what happens when you approach the speed of light. After 1 year of traveling at near light speed if you came back to Earth you would come to find that potentially hundreds of years have elapsed here)Source: wikipedia, Image: pixabay

23

The human body is actually bioluminescent, which means that you produce light! Unfortunately that light is far too dim for you to see.

The human body is actually bioluminescent, which means that you produce light! Unfortunately that light is far too dim for you to seeSource: io9.com, Image: pixabay
22

In space, astronauts sometimes see bright flashes due to cosmic rays striking their retina. This doesn't happen down here on Earth thanks to protection from the magnteosphere.

In space, astronauts sometimes see bright flashes due to cosmic rays striking their retina. This doesn't happen down here on Earth thanks to protection from the magnteosphereSource: wikipedia, Image: pixabay

21

LED traffic lights have actually led to crashes. This is because they don't emit enough heat to melt potential snow cover during winter months.

LED traffic lights have actually led to crashes. This is because they don't emit enough heat to melt potential snow cover during winter monthsSource: abcnews.go.com, Image: pixabay


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