ENLIGHTENING FACTS ABOUT LIGHT AND VISION

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)

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!

THE HUMAN BODY IS ACTUALLY BIOLUMINESCENT,

WHICH MEANS THAT YOU PRODUCE LIGHT!

UNFORTUNATELY THAT LIGHT IS FAR TOO DIM

FOR YOU TO SEE

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 MAGNETOSPHERE.

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

TACHYONS ARE HYPOTHETICAL PARTICLES THAT TRAVEL

FASTER THAN THE SPEED OF LIGHT. THEY HAVE

IMAGINARY MASS (SQUARE ROOT OF -1) AND EXPERIENCE

TIME IN REVERSE

SOME NASA IMAGES TAKEN OF THE EARTH AT NIGHT

ONCE SHOWED EXTREMELY BRIGHT LIGHTS IN THE

MIDDLE OF THE DESERT IN AUSTRALIA. IT TURNS

OUT THAT A SIGNIFICANT SWATH OF THE CONTINENT

WAS ENGULFED IN BRUSH FIRES THAT BURNED EVEN

BRIGHTER THAN THE COASTAL CITIES

PEACOCK FEATHERS ARE ACTUALLY BROWN. IT IS

THEIR MICROSCOPIC STRUCTURE (STRUCTURAL

PIGMENTATION) THAT CAUSES THEM TO REFLECT

SO MANY COLOURS LIKE RED, BLUE, AND GREEN.

ALTHOUGH THE SPEED OF LIGHT IN A VACUUM IS

CONSTANT (C), IN DIFFERENT MATERIALS LIGHT

MAY NOT TRAVEL OR PROPAGATE AS QUICKLY