APOD: Supernova Remnant Puppis A (2014 Sep 12)

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Expand view Topic review: APOD: Supernova Remnant Puppis A (2014 Sep 12)

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by bystander » Tue Sep 16, 2014 2:12 pm

I admit, you had me confused. I had to go look to make sure.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by starsurfer » Tue Sep 16, 2014 6:23 am

Oh I must have got the two mixed up! :oops:

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by bystander » Mon Sep 15, 2014 9:23 pm

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)

by jsmunroe » Mon Sep 15, 2014 1:10 pm

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)

by rstevenson » Mon Sep 15, 2014 1:03 pm

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)

by Nitpicker » Mon Sep 15, 2014 12:15 pm

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)

by starsurfer » Mon Sep 15, 2014 12:09 pm

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?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by NCTOM » Mon Sep 15, 2014 11:41 am

Thanks for the responses. Always educational.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Chris Peterson » Sun Sep 14, 2014 4:21 pm

ta152h0 wrote:how far does " nearby " have to be to not be " nearby " anymore ?
If you're talking about the Earth, a supernova within about 100 ly is near enough that its gamma emissions will have some impact on life (mostly through indirect mechanisms like modification of the ozone layer). Such events have occurred several times since complex life developed on Earth, and probably influenced life's evolutionary path.

On planets without thick atmospheres, or with smaller magnetic fields, the critical distance could be somewhat farther. Also, a farther event which had a jet axis aligned with the Earth (or other planet) could affect life.

There are currently no supernova candidates closer than 100 ly.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Ann » Sun Sep 14, 2014 4:14 pm

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

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by ta152h0 » Sun Sep 14, 2014 3:31 pm

how far does " nearby " have to be to not be " nearby " anymore ?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Chris Peterson » Sun Sep 14, 2014 1:22 pm

Guest wrote:The spread of the gas at that velocity, 180LY in 3700y, is fast and although tenuous it must cause disruption to the solar wind of nearby stars (out to 20 - 50 - 100LY ???) with the consequences for any life on planets around those stars. Are there any stars within a 100LY from us likely to go supernova?
Why would you expect some interaction with a star's solar wind to have any consequences for life around a planet?

The radiation created by a nearby supernova could certainly represent a problem. The actual material, however, probably not.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Guest » Sun Sep 14, 2014 12:45 pm

NCTOM wrote:What would be the impact of these massive shock waves on nearby star systems, say within twenty light years?
The spread of the gas at that velocity, 180LY in 3700y, is fast and although tenuous it must cause disruption to the solar wind of nearby stars (out to 20 - 50 - 100LY ???) with the consequences for any life on planets around those stars. Are there any stars within a 100LY from us likely to go supernova?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by ta152h0 » Sat Sep 13, 2014 4:10 am

this looks like a grape pod. Did this thing explode all at once, or was this a summation of a bunch of explosions ?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Nitpicker » Fri Sep 12, 2014 10:24 pm

Given its place in Puppis (the poop deck of Argo Navis), what about Jason's Fist or Argonaut's Fist?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by FloridaMike » Fri Sep 12, 2014 10:14 pm

I dub thee the "Fist Bump Nebula" ... HA!

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by geckzilla » Fri Sep 12, 2014 4:46 pm

jsmunroe wrote:
User loser wrote:Like the fist of an angry god!
Or a fist bump. Why do we always make gods angry? Maybe they just want props. :p
What makes gods have hands at all? A lack of imagination. :wink:

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Chris Peterson » Fri Sep 12, 2014 2:03 pm

Anna Phylaxis wrote:I don't understand how that angry fist can be 7,000 light years away and yet became visible to us 3,700 years ago. Surely the light from the supernova didn't break its own speed limit, did it? :?
It doesn't matter when it "really" happened. There's always an error in our knowledge of distance, and it would be silly to always be changing our time as our understanding of distance changed.

In physics we almost always time events by when they are observed. This is particularly true with astronomical observations.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by jsmunroe » Fri Sep 12, 2014 1:58 pm

User loser wrote:Like the fist of an angry god!
Or a fist bump. Why do we always make gods angry? Maybe they just want props. :p

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by lmpr8r » Fri Sep 12, 2014 1:47 pm

I like how some of the objects are named with a "common name". Does supernova remnant Puppis A have a common name? If not, I recommend "The Fist". At least from the vantage point shown and until the gasses and dust filaments drift into another configuration, it does look like a defiantly/angrily clenched hand.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Nitpicker » Fri Sep 12, 2014 1:15 pm

Anna Phylaxis wrote:I don't understand how that angry fist can be 7,000 light years away and yet became visible to us 3,700 years ago. Surely the light from the supernova didn't break its own speed limit, did it? :?
The supernova popped 10,700 years ago, but its light only arrived at Earth 3,700 years ago, as a bright flash in the sky, before expanding in size and dwindling in brightness to the remnant we detect today, mainly outside the visible spectrum.

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Anna Phylaxis » Fri Sep 12, 2014 12:56 pm

I don't understand how that angry fist can be 7,000 light years away and yet became visible to us 3,700 years ago. Surely the light from the supernova didn't break its own speed limit, did it? :?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by NCTOM » Fri Sep 12, 2014 11:57 am

What would be the impact of these massive shock waves on nearby star systems, say within twenty light years?

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by Boomer12k » Fri Sep 12, 2014 11:18 am

Must have been a Sight to see when it happened....

:---[===] *

Re: APOD: Supernova Remnant Puppis A (2014 Sep 12)

by yasgur » Fri Sep 12, 2014 9:58 am

User loser wrote:Like the fist of an angry god!
It does look a bit like a clenched fist, doesn't it. Although, it seems to have it's thumb tucked inside it's fingers against the palm which is the road to dislocation. :)

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