Comments on: Beyond the Heliosheath: ISM Traverse & The Local Fluff

By: Eiko

Eiko — Sat, 04 Aug 2012 02:09:26 +0000

Yes, it's an old argument to many of us. Other hand, it's just aeohtnr statement in a long debate. I think there's a kind of social argument going about whether manned space flight makes any sort of sense in the long range, comparable in some ways to the long argument about whether slavery was morally acceptable.I.e., matters of fact are of less signifiance to the participants than their emotional states; and the debate will likely be decided by force majure (e.g., a Civil War) than by logical agreement. Some people like the idea of humans spreading into the cosmos; others find the notion pointless or even repellent. This isn't going to be resolved for all time by a handful of (mostly) American citizens arguing in the year 2010.Not to say this is an argument for ceasing to argue

By: Channel Hopper

Channel Hopper — Tue, 19 Jun 2012 13:34:13 +0000

Could one of you eminent astonomers/philosofers give an answer to this point on the NASA Voyager link?

‘The first feature encountered by a spacecraft as a result of this interstellar wind/solar wind interaction was be the termination shock where the solar wind slows from supersonic to subsonic speed’

Space, being a virtual vacuum (where nobody can hear you scream) sound therefore doesn’t really exist. What therefore is the correct measured velocity at which sound travels in interstellar space ?

By: Tom Kerwick

Tom Kerwick — Tue, 29 May 2012 07:30:56 +0000

Ray — not a bad analogy to the ionosphere — and I was not suggesting an entrapment — just potential hazards that provide engineering challenges.

Flash — I don’t think it was suggested that the heliosheath stops cosmic rays — or agree that it is more about photons (??) — as stated above is more about where the protons and electrons of the solar wind reach a termination shock where these slow to subsonic velocities and result in a buildup of turbulence and also an increase in density in the mainly hydrogen atoms of the local fluff which it is pushing against.

My use of the phrase ‘hydrogen wall’ may have misled a little in the above: Think of it as an afront of two mediums pushing against each other — a skin of higher density material and high turbulence would manifest where they interact. This slowing to sub-sonic velocities refers more to typical solar wind particles of up to 10 KeV of course. One would expect the higher energy cosmic rays to shoot through largely unaffected.

By: Sylvana

Sylvana — Tue, 29 May 2012 07:19:25 +0000

Nice propositional argument post! You know that I am been a open that our scientists can still discover new knowledge out in our solar system.

By: flashgordon

flashgordon — Sat, 26 May 2012 21:29:51 +0000

Cosmic rays with the heliosheath pose problems; the question is does the Heliosheath stop any cosmic rays; i doubt it.

The heliosheath is more about photons than solar storms(electrons and protons). The Stars might look brighter out past our own Heliosheath(I remember a recent astronomy article about the advantages of astronomical seeing out past the Heliosheath; they’re that detailed folks!) But, that’s not like sunburn levels.

To say the least, I don’t see the Heliosheath as some Ptolemaic crystal sphere that would hurt to go through!

By: Ray Wright

Ray Wright — Sat, 26 May 2012 08:52:32 +0000

Some decades ago, it was claimed that travel above the atmosphere would be impossible due to the extreme temperature of th ionosphere. That was confusing temperature with heat. Some people actually thought that spacecraft attempting to leave the Earth would flash into vapour. The solar wind does protect us from high energy particles from deep space, and so does our atmosphere, but a few feet of rock would do that too. So if we ever get around to building space arks for humans to venture into interstallar space, they will need protection, but that coud be done by mining an asteroid for the rock, and laying it down between an inner and outer hull. We need not feel so pessimistic that we are trapped within the solar system. We are not trapped in that way, but what worries me is that the global economy will become so strained in the decades to come that the ability to build anything in space will disappear, so the time to develop re-usable transport to space is now — or never.

By: x

Sat, 26 May 2012 07:44:21 +0000

Thank you for sharing.
This is exciting news!

So many mysteries still abound right here in our own “little” solar system.. and on the edge of it!

By: Tereza Ullinovich

Tereza Ullinovich — Sat, 26 May 2012 00:38:47 +0000

Great article, thank you. Most people, such as me, can only imagine how wonderful it is–space exploration and the future in space. Good article.