Another Universe question

[Capt Bravz]

TwigtheWonderkid said:

Should have taken the Bugatti Veyron, and saved some time.

Yeah, but IMHO the Lambo looks nicer and if I'm cruising space I want to look good. Don't forget also I wasn't maxing the car just a steady 200 mph ;-)

[scorp]

RobDickinson said:

Voyager 1 is doing 62,136 km/h and still took 36 years to leave the solar system!

Interestingly, if you constantly accelerated at 1G you would hit the speed of light in around a year (ignoring relativity)

[IvanSTi]

N8CYL said:

To help a simpleton like me get a handle on the size of the universe, if the sun was the size of a grain of sand, how big would the known universe be?

N8CYL - this was a nice link posted not long ago when trying to comprehend how long forever is, ie how long religious people want to live in the afterlife.

Part of it gives you an idea of how big the known universe is.

http://waitbutwhy.com/2014/11/1000000-grahams-numb...

[N8CYL]

IvanSTi said:

N8CYL - this was a nice link posted not long ago when trying to comprehend how long forever is, ie how long religious people want to live in the afterlife.

Part of it gives you an idea of how big the known universe is.

http://waitbutwhy.com/2014/11/1000000-grahams-numb...

Not seen this before, its mind blowing really, but well written. Its also amazing that in some ways we are so small in respect to the vastness of space but also so big in the minuscule world of atomic particles.

[CrutyRammers]

IvanSTi said:

N8CYL - this was a nice link posted not long ago when trying to comprehend how long forever is, ie how long religious people want to live in the afterlife.

Part of it gives you an idea of how big the known universe is.

http://waitbutwhy.com/2014/11/1000000-grahams-numb...

Well, I'd heard of it and not thought much about it. Now my soul aches. Thanks.

[kowalski655]

Capt Bravz said:

Yeah, but IMHO the Lambo looks nicer and if I'm cruising space I want to look good. Don't forget also I wasn't maxing the car just a steady 200 mph ;-)

And if you break down,then you will have to wait 2000 years for the RAC to get to you.

[TwigtheWonderkid]

kowalski655 said:

Capt Bravz said:

Yeah, but IMHO the Lambo looks nicer and if I'm cruising space I want to look good. Don't forget also I wasn't maxing the car just a steady 200 mph ;-)

And if you break down,then you will have to wait 2000 years for the RAC to get to you.

No change there then.

[annodomini2]

scorp said:

RobDickinson said:

Voyager 1 is doing 62,136 km/h and still took 36 years to leave the solar system!

Interestingly, if you constantly accelerated at 1G you would hit the speed of light in around a year (ignoring relativity)

You still would, but generating the force to continue to accelerate at 1G is the issue.

[Einion Yrth]

annodomini2 said:

scorp said:

RobDickinson said:

Voyager 1 is doing 62,136 km/h and still took 36 years to leave the solar system!

Interestingly, if you constantly accelerated at 1G you would hit the speed of light in around a year (ignoring relativity)

You still would, but generating the force to continue to accelerate at 1G is the issue.

Time dilation would mean that it wouldn't seem as long either, plus of course the tendency towards C would be asymptotic.

[p1stonhead]

RobDickinson said:

Voyager 1 is doing 62,136 km/h and still took 36 years to leave the solar system!

Download space engine to really see what a ridiculous size the universe is. It's an incredible game/programme.

[Dr Jekyll]

https://www.physicsforums.com/threads/scale-of-the...

No simple answer apparently.

[N8CYL]

IvanSTi said:

N8CYL said:

To help a simpleton like me get a handle on the size of the universe, if the sun was the size of a grain of sand, how big would the known universe be?

N8CYL - this was a nice link posted not long ago when trying to comprehend how long forever is, ie how long religious people want to live in the afterlife.

Part of it gives you an idea of how big the known universe is.

http://waitbutwhy.com/2014/11/1000000-grahams-numb...

The fact about atoms in a grain of salt is mind blowing.

[Baron Greenback]

This article is a bit beyond me but Milky Way galaxy is at least 50 percent larger than is commonly estimated! Extending the known width of the Milky Way from 100,000 light years across to 150,000 light years!

http://phys.org/news/2015-03-corrugated-galaxy-mil...

[kowalski655]

"The Galaxy,ribbed for her pleasure"

[IvanSTi]

I'm an amateur photographer and was just looking at images of the Milky Way (Due to reading this last couple of posts on the thread) and some of the photographs look amazing and you can see the bright centre as illusrtated in many images too.

Like these for example




Then I came across this image. This photograph just wins. the only image which is going to beat this is a picture of the earth exploding or being eaten up by our sun.

[Moonhawk]

IvanSTi said:

Then I came across this image. This photograph just wins. the only image which is going to beat this is a picture of the earth exploding or being eaten up by our sun.

That last one isn't a photograph - it even says so in the bottom left corner

Cool image though.

[IvanSTi]

Moonhawk said:

IvanSTi said:

Then I came across this image. This photograph just wins. the only image which is going to beat this is a picture of the earth exploding or being eaten up by our sun.

That last one isn't a photograph - it even says so in the bottom left corner

Cool image though.

You're right, I am disappointed. The search continues for the ultimate image.

I didn't notice that in the bottom left as I'm using a 1/4 of my screen for the interweb so no one can see what I'm doing

http://gizmodo.com/5912184/this-mind-blowing-image...

[qube_TA]

Capt Bravz said:

TwigtheWonderkid said:

Should have taken the Bugatti Veyron, and saved some time.

Yeah, but IMHO the Lambo looks nicer and if I'm cruising space I want to look good. Don't forget also I wasn't maxing the car just a steady 200 mph ;-)

comfort is important on long trips.



Liquid Schwartz can help save time too.

[RobDickinson]

IvanSTi said:

I'm an amateur photographer and was just looking at images of the Milky Way (Due to reading this last couple of posts on the thread) and some of the photographs look amazing and you can see the bright centre as illusrtated in many images too.

Like these for example




Then I came across this image. This photograph just wins. the only image which is going to beat this is a picture of the earth exploding or being eaten up by our sun.

Yep that last one is CGI.

Astro photography is good fun but you need dark skies to pull it off ( you can in some places in the UK).

I have an astro workshop this friday at Aoraki dark sky reserve (gold standard, bortle scape 1-2).

This from a few weekends ago.
100 million by robjdickinson, on Flickr

[PhysDoc]

I know a thing or two about this. Can't remember the exact figures off-hand and this is only a rough and ready estimate, but the universe is roughly 15 billion=15x10^9 years old, which means the observable universe is roughly 15 billion=15x10^9 light years across (Because light travels 1 light year in a year, and it has `only' had 15 billion years to travel.)

One light year is about 10^13km, so the observable universe is roughly 1.5x10^23km across. The diameter of the sun is roughly 1.5x10^6km, so the observable universe is 1.5x10^23/1.5x10^6=10^17 times larger than the sun.

So if the sun was only about 0.1mm across -- I guess roughly the size of a grain of sand -- the observable universe would be 10^16mm=10^10km which I think is roughly the same diameter as the solar system.

May have made a mistake though.