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Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Mon Sep 15, 2014 12:15 pm
by Nitpicker
starsurfer wrote:Ann wrote:ta152h0 wrote:how far does " nearby " have to be to not be " nearby " anymore ?
Well, that depends.
Since the approximate radius of the Milky Way is about 50,000 light-years, a supernova 7,000 light-years away is pretty nearby.
Ann
I thought the radius of the Milky Way was approximately 100,000 light years?
I suppose it depends on where you define the edge to be, but Wikipedia says a radius of 50,000 to 60,000 light years.
Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Mon Sep 15, 2014 1:03 pm
by rstevenson
starsurfer wrote:I thought the radius of the Milky Way was approximately 100,000 light years?
The diameter of the Milky Way is about 100,000 to 120,000 ly.
Rob
Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Mon Sep 15, 2014 1:10 pm
by jsmunroe
starsurfer wrote:Ann wrote:ta152h0 wrote:how far does " nearby " have to be to not be " nearby " anymore ?
Well, that depends.
Since the approximate radius of the Milky Way is about 50,000 light-years, a supernova 7,000 light-years away is pretty nearby.
Ann
I thought the radius of the Milky Way was approximately 100,000 light years?
Nope. diameter is 100k. Radius is 50k.
Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Mon Sep 15, 2014 9:23 pm
by bystander
starsurfer wrote:
I thought the radius of the Milky Way was approximately 100,000 light years?
Wikipedia wrote:
The Milky Way is a barred spiral galaxy some 100,000–120,000 light-years in
diameter, which contains 100–400 billion stars.
That would be 50-60 thousand light-years in radius.
Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Tue Sep 16, 2014 6:23 am
by starsurfer
Oh I must have got the two mixed up!
Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)
Posted: Tue Sep 16, 2014 2:12 pm
by bystander
I admit, you had me confused. I had to go look to make sure.