Speed & Light
If we are to understand Space we need to take a closer look.
When we look into the night sky above us, we are looking as it was hundreds of years ago, as the light has to travel thought space down to us on Earth.
Nothing is faster than light
Let us look at different speeds on earth.
An Olympic Runner can run at 28mph.
A Racehorse can get speeds of 50mph.
A Rice Car can get speeds of 240mph.
A Jet Fighter with speeds of 1000mph.
The Space Shuttle in Orbit at speeds of 17,000mph.
The fastest man made object to date is the New Horizons probe, which was launched on 19 January 2006 and is a NASA robotic spacecraft mission currently en route to the dwarf planet Pluto. Speed 52,000mph.
It will arrive at Pluto on 14 July 2015
So how far would we get if we traveled around the Universe in a car, travelling at 100mph?
If we travelled in a car at 100mph it would take us 30 hours to travel coast to coast across America.
If we travelled in a car at 100mph to our moon, it would take us 14 weeks.
Speed in Space
Astronomical Unit (AU).
The Digital Universe
measures distance in light-travel time rather than in kilometers or
Light-travel time refers to the
distance light travels over a given time.
At that speed, the light-year becomes a convenient unit of distance in the Milky Way.
Speed of Light
669,600,000 miles per Hour x 24 Hours.
16,070,400,000 miles per day x 365 Days
= 1 Light Year
It takes 499.0 seconds for light to
travel from the Sun
This gives some idea how of what the
speed of light
Next : Einstein's Special Theory of Relativity E=mc2 speed of light