Thoughts 20
If you want to enlarge the pictures so that the names can be read, hold down the Ctl key and tap the plus + key.
We
have the standards that have been set up to represent distances in
the universe from the last post. Let's take a trip to other places
besides Earth.
First
let's go to the Sun from Earth. It is approximately 93,000,000 miles
(one AU, Astronomical Unit) from us. If we could travel at the speed
of light (nothing can go faster in the universe as we understand it
today) it would take 8 seconds to reach our destination. Of course we
cannot come close to reaching even a large fraction of the speed of
light which is 186,000 miles per second.
If
we were to travel to Pluto which is 366,600,000,000 miles (39.5AU) from the
sun, it would take us approximately 228 days at the velocity of light
if Earth was as close to Pluto as we get.
Taking
close to two-thirds of a year to get to Pluto, it would take 4.2
years to get to the Alpha Centauri system which is made up of three
stars.* They are the
closest stars to us. Again we would be traveling at the speed of
light. From this point in our trip distances will be in light years
or parsecs.
In the above picture notice that the smallest white dot is Sirius.
The
Milky Way, our galaxy, is approximately 100,000 light years in
diameter and 7,000 light years thick. It is a spiral arm galaxy (some
say a barred spiral arm). Our solar system is somewhere is the area
of ½ to 2/3 the from the center of our galaxy, located in one of the
arms. The Milky Way is made up of 1 hundred-billion to 4
hundred-billion stars.** Many of these stars have planets rotating
around them.
We
have made a very limited trip through the solar system and then the
Milky Way galaxy. Let's move into the void between galaxies. Our
galaxy is moving in relation to others within what we know as the
local group. The first picture gives the galaxies that are within
500,000 light years of us. The second picture shows the entire local
group. ***
If
you notice, the measurement is in millions of light years for the
whole local cluster. Let's go about 3.5 million light years toward
the galaxy Sextans A and stop in the void to look back to where we
came from.
Just as we look at our bodies as a whole because we are
more than the sum of our parts as we can understand them, we have
looked at the Earth as a whole by using the same type of standards so
our intellect can understand. The same as we do for everything else. Now looking
back, we see a mediocre star that is not special in any way, about
2/3s of the way toward the rim of the Milky Way galaxy which is one of
countless billions. We can see specks orbiting. Watching closely we
can see the third speck out from this star is taking the first steps
to exploring other bodies close to it. Could this inconsequential
little speck be a living entity? While looking back from this position I know
the true meaning of the word awesome. It
is joyous and fearful at the same time.
Two pictures
from duckduckgo
All other
pictures from google
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