Guess I gotta start a new one.
Posted 17 March 2012 - 09:00 AM
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
Our solar system, is located in the Orion-Cygnus arm of the Milky way galaxy. A spur in the outer part of the galaxy. It takes our solar system
approximately 225 - 250 million years to complete one orbit of the galaxy. So, we've orbited the galaxy about 18 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 29 March 2012 - 04:26 AM
Posted 10 July 2012 - 03:31 AM
Posted 08 August 2012 - 11:38 PM
We are so infinitesimal. And the universe is so beautiful!
on the flip side, we are so unimaginable HUGE from the subatomic perspective...
Posted 11 August 2012 - 07:29 AM
Posted 11 August 2012 - 07:29 AM
Posted 09 November 2012 - 04:09 PM
When gazing at the sky on a clear night what a speck we are comes to mind. Gazing into the seemingly endless blue during the day, sometimes peeking at the stars beyond the blue brings forth the same.
The sky is not actually blue.
Posted 21 November 2012 - 09:02 PM
The sky is not actually blue.
Ok, I respect your premise. But this is a philosophical discussion. Not a statement of actual fact.
Although for accuracy's sake, you are correct. I still like to think of the sky as "blue".
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 24 January 2013 - 08:34 AM
The universe is bigger than you can imagine. But it's fun to keep dreaming.
Posted 03 February 2013 - 07:16 PM
great thread, don't know why I've never been in this forum before
Posted 15 April 2013 - 05:55 AM
So the multiverse theory is an idea I've been dwelling on for a while now. Yeah, our universe is unimaginably large.
Try and imagine several. Maybe an infinite number, of unimaginably large universes.
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).
Posted 28 November 2013 - 09:49 PM
Our Voyager spacecraft, have reached, and gone past the edge of our solar system. Launched in 1977, Voyager one and two,
represent mankind's first reach into interstellar space. Voyager one reached the heliopause on aug 25th 2012. The heliopause,
is the boundary of our solar system. It is where the solar wind, generated by our sun, meets interstellar space, and the two forces
equalize. The space craft took approximately 35 years to reach that point. Traveling at an average speed of 36,000 MPH. But as
exciting as that is, it would still take 40,000 years before it could reach our nearest cosmic neighbor, Proxima Centauri. And we
will lose contact with them long before that. It's an interesting idea, that we have spaceships out there. Way out there. Almost two
light years away.
Some interesting reading; http://en.wikipedia....iki/Heliosphere
Another fun page; http://wiki.answers....t_galaxy#slide1
Posted 23 February 2014 - 09:50 PM
At some point in the next year, the black hole at the center of our galaxy, Sagittarius A, will dine on a gas cloud named, G2.
This will be the first time we have been aware of, and will be able to observe, anything that large interacting with Sgr A.
At that point, radio telescopes around the world, will focus on Sgr A, in an attempt to create a planet sized observatory,
called "Event Horizon telescope". Hopefully to observe, and record a black hole in action. The black hole itself, can never be
observed, because it's gravity is so strong, it traps even light. But rather the effects on the space around it will be observed.
Posted 31 March 2014 - 01:43 AM
I highly recommend watching Cosmos, with Neil Degrasse Tyson. He's talking about all this stuff. It's a great show.
Posted 09 January 2015 - 08:08 AM
The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy.Estimates of the length of one orbit range from 225 to 250 million terrestrial years. The Solar System is traveling at an average speed of 828,000 km/h (230 km/s) or 514,000 mph (143 mi/s) within its trajectory around the galactic center, which is about one 1300th of the speed of light—a speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds.
The galactic year provides a conveniently usable unit for depicting cosmic and geological time periods together. By contrast, a "billion-year" scale does not allow for useful discrimination between geologic events, and a "million-year" scale requires some rather large numbers.
Timeline of universe's and earth's history in galactic years
The following list assumes that 1 galactic year is 225 million years.
About 61 galactic years ago Big Bang
About 54 galactic years ago Birth of the Milky Way
18.4 galactic years ago Birth of the Sun
17-18 galactic years ago Oceans appear on Earth
15 galactic years ago Life begins on Earth
14 galactic years ago Prokaryotes appear
13 galactic years ago Bacteria appear
10 galactic years ago Stable continents appear
7 galactic years ago Eukaryotes appear
6.8 galactic years ago Multicellular organisms appear
2.8 galactic years ago Cambrian explosion
1 galactic year ago Permian–Triassic extinction event
0.26 galactic years ago Cretaceous–Paleogene extinction event
0.001 galactic years ago Appearance of modern humans
22 galactic years in the future The Milky Way and Andromeda Galaxy begin to collide
Posted 09 January 2015 - 11:39 AM
Posted 09 January 2015 - 08:07 PM
So basically the meaning of our entire existence and struggles is in service to the creation of a White Dwarf.
Looks like it. But knowing the inevitable conclusion, an alternate fate could possibly be devised.
If we're still here at that point, I'd give us a lot of credit, just for surviving.
And I think we'd be evolved enough to save ourselves.
But that's mere speculation.
Posted 20 January 2015 - 07:42 AM
This is a great video, that helps give some perspective.