MEASUREMENT IN SPACE!!!!!!!
DISTANCE
The “space” between objects in space is so large
that normal units of measurement don’t work;
for example the sun is 93,000,000,000,000
miles away from the earth,
Thus scientists created a unit based on this
distance which we call an astronomical
unit(AU).
This unit is useful when measuring distances
within our own solar system.

The Solar system as a whole has a
measurement of roughly 150,000 A.U.
While the A.U. may seem huge in terms of the
universe this is a small distance.
 The distances between individual stars and
galaxies is much too large in to use A.U. ‘s
 Thus another unit was created:

LET THERE BE LIGHT!!!!

This unit is based on the one true constant we
have discovered in the universe:
 THE
SPEED OF LIGHT!!!!!!
Light travels at a speed of 300,000,000 m/s
 Using this value scientists have calculated the
distance light travels in a given year and use
this a the astronomical unit of measurement
known as a light year.


http://www.youtube.com/watch?v=9BjHvwSvp
Ow
THE DIAMETER OF THE SOLAR SYSTEM IS
ROUGHLY 1.6 LIGHT YEARS
OUR GALALXY ANY GUESSES ON SIZE?
OUR LOCAL CLUSTER OF GALAXIES. ANY
GUESSES?
VISIBLE UNIVERSE?