[dragonsniper]

Title says it all. Would there be any nebula's in Capella after the Shivan's destroyed it?

[tinfoil]

probably eventually

[dragonsniper]

After how many years...?

[Mobius]

Why not? Supernovae are important for the creation of nebulae and new star systems.

 If I remember well Warzone featured a nebula in which the player found the debris of a Sathanas.

[tinfoil]

After how many years...?

not too many i would think. the gases and stuff would be floating around pretty soon after the supernova

[Mars]

IIRC someone said that the expansion would rapidly cool down the gas.

[Mobius]

Rapidly still means that it'll take a while before ships can pass through it unaided.

[dragonsniper]

Maybe I should clarify a bit. I mean nebula as in the background nebula (from other system nearby perhaps.)

[Mobius]

Eh?

[dragonsniper]

This is what I mean

[attachment stolen by Slimey Goober]

[Jeff Vader]

Uh... as in, would there be any stars if Earth was destroyed?

[Ziame]

Well, dragonsniper, these kind of Capella will be seen in closest system  hundreds of years from now. You know, for example, the Sun you see on the sky is seven minutes old, get my drift?

[KappaWing]

Dude what are you trying to say?

1) Would Capella be visible as a nebula from the perspective of another star system?

Not for at least several years, since stars are several light years away on average. This is assuming they are nearby stars.

2) Would pre-existing nebulas be visible from Capella after the supernova?

Probably not. You would likely see a nebula all around you, but that would be ionized gas from the supernova, not distant nebulas. If you are close enough to the neutron star, there would be no nebula at all, since all the gas was ejected at high velocity.

[Flipside]

Also, with the expansion rate, even at the velocities that ionised gas is travelling at during a supernove, it will take a decade or two for the cloud to become large enough to be visible.

[dragonsniper]

Hmmmm... Not really what I wanted to hear, but ok.

[castor]

Also, with the expansion rate, even at the velocities that ionised gas is travelling at during a supernove, it will take a decade or two for the cloud to become large enough to be visible.

Doesn't that depend on the distance you're viewing it from? I'd digest a nebula there shortly after, considering the loose physics FS is using.
EDIT: never mind, I see he is referring to "nearby systems" later down.

[Mars]

Any systems nearby enough to see the nebula by eye within a decade would probably be hit by all sorts of lovely radiation as well.

[Rodo]

if there's a nebula after an eventual supernova, it would not be visible to the naked eye, the ones that we can see are there because they already have thousands of years and they have developed stars that emit light and therefore make the nebula visible. (I guess)

[KappaWing]

Also, with the expansion rate, even at the velocities that ionised gas is travelling at during a supernove, it will take a decade or two for the cloud to become large enough to be visible.

Really? Even if the supernova was as little as 4ly away?

Most supernovae we observe within our galaxy are about 50,000ly away.

[Droid803]

Well, to be visible without a telescope, yes, it'd probably take some time, even for a system relatively close by.