Guess I gotta start a new one.
Posted 17 March 2012 - 09:07 AM
Ok. We live in a galaxy called the Milky Way. At it's center is a super massive black hole called Sagittarius A.
The galaxy is a disk-shaped structure. Earth is located within the galactic plane of this disk, around two thirds
of the way out from the center, on the inner edge of a spiral-shaped concentration of gas and dust called the
Orion–Cygnus Arm. The Milky Way is a barred spiral galaxy 100,000–120,000 light-years in diameter containing
200–400 billion stars. Makes you feel small, doesn't it?
Posted 23 March 2012 - 07:46 AM
Posted 23 March 2012 - 07:57 AM
approximately 250 million years to complete one orbit of the galaxy. So, we've orbited the galaxy about 20 times since our planet was formed.
Posted 27 March 2012 - 07:54 AM
As a comparison, think of this. If you put a quarter on the ground, and think of that as the size of our solar system,
the entire north American continent would be roughly the size of the galaxy.
Posted 21 November 2012 - 09:12 PM
Data extrapolated from the mission so far, would suggest, there are more than 150 billion planets in our galaxy alone. Imagine how many galaxy's there could be,
and multiply times 150 billion. We can't even conceive of numbers that big. We may be able to compute it, or even write it down if we wanted. But to wrap your mind
around the scale of it, is impossible. At least for me. I do enjoy trying though.
Posted 12 January 2013 - 06:30 AM
The nearest star to us, is called Proxima Centauri. It is about 4.24 light years away.
The fastest spaceship we've ever built, topped out at at just over 157,000 MPH.
At that speed, it would take about 17,000 years to get there.
Pick up the latest National Geographic. Amazing issue, devoted to what makes us want to explore.
Posted 15 April 2013 - 09:37 AM
So the multiverse theory is an idea I've been dwelling on for a while now.
Watched a pretty interesting PBS show on this a little while back. Neat stuff. They've got a few good shows that actually break stuff down to a reasonably understandable level for the general pop (string theory, relativity, and the like).