Comments on: Night FLIERs

By: Astro Web — El Hubble examina cuatro estrellas muertas

Astro Web — El Hubble examina cuatro estrellas muertas — Wed, 19 Sep 2007 18:36:23 +0000

[...] IC 4593 estÃ¡ abajo a la izquierda y se encuentra en la constelaciÃ³n septentrional de HÃ©rcules. Mi buen amigo Phil Plait realizÃ³ un buen escrito sobre este objeto asÃ que os enlazo a este sitio para ver la exclusiva. [...]

By: sara

sara — Sat, 15 Sep 2007 06:19:37 +0000

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By: Buzz Parsec

Buzz Parsec — Fri, 14 Sep 2007 02:49:42 +0000

Could the mass and locations of the progenitor star’s planets be infered from the structure of the nebula? Or is what we see here actually much larger than a typical planetary system, implying that by the time the nebula has expanded enough to be larger than a point source and have any visible structure, it is vastly bigger than the orbits of any planets originally orbiting the star, and has been distorted too much to be useful? I.E., what’s the image scale? (The link says it’s about 7000 lightyears distant, which seems pretty far to see something as small as a solar system, but there’s no angular size listed that I could see.)

Anyway, if the swirls and whirls are caused by abrupt changes in angular momentum as the expanding nebula encounters and absorbs planets, then presumably the rare smooth ones are from planetless stars, and the common contorted nebulae are from stars with planets. Which means planetary nebulae have something to do with planets after all

By: Motorhomes

Motorhomes — Thu, 13 Sep 2007 18:07:12 +0000

Great picture! I love your blog. Just found it as a matter of fact.

By: El Hubble examina cuatro estrellas muertas on MuiDark

El Hubble examina cuatro estrellas muertas on MuiDark — Thu, 13 Sep 2007 14:24:32 +0000

By: Tim G

Tim G — Thu, 13 Sep 2007 06:50:50 +0000

Grade 10 Science,

If you use a rotating coordinate system, the the math works out if you use a center-fleeing (centrifugal) force, such as one that would “flatten out” stellar wind.

Since he used the phrase, “flatten out”, I thought that centrifugal (center-fleeing) would be the more appropriate term.

By: Grade 10 Science

Grade 10 Science — Wed, 12 Sep 2007 21:34:32 +0000

I had a physics teacher who told me that centrifugal force doesn’t actually exist. It’s ALL centripetal force. Just sayin’ is all.