The Crab Nebula

"Llanzlan Klazmon The 15th" wrote in message
7.6...
(G=EMC^2 Glazier) wrote in
:

Hi Rgds I find that interesting that Venus can be seen in day
light,if you know where to look. I think I read(long time ago)
that this supernova explosion's light lasted for two weeks. Was that
the length of the explosion?
I would think being an explosion the light would
only last a second,especially since the supernova is surrounded by
just the vacuum of space.

With a type II supernova that forms a neutron star via collapse, you
have a pretty complex situation. The neutron star is very small compared
to the original star and initially will be furiously oscillating. Theory
says that these oscillations would damp out rapidly via gravitational
radiation (the LIGO experiment is currently trying to detect such
radiation from such a collapse event - no nearby type II's have occurred
since LIGO has been running though). The neutron star will also have an
enormous temperature (billions of degrees). It gets rid of a lot of this
energy by neutrino emission and eventually normal thermal radiation from
its' surface. In the mean time the outer layers of the star get blown
off by a gigantic shock wave which also causes all sorts of nuclear
reactions to take place. The debris glows brightly from thermal
radiation and it is also being pumped with additional energy from
radioactive decay. The debris doesn't reach its peak brightness in the
optical spectrum until quite a while after the actual blast. The debris
continues to glow and expand for thousands of years after the supernova.
That is why we can still see the crab nebula today.

Could these great explosions disrupt the fabric of
space? I'm working on a theory that space creates inertia,and it could
fit in here nicely. Its on the lines of Mach thinking Bert


That isn't a theory. You need to do a bit of learning.

Llanzlan.

When you say the 'fabric of space', are you infering that 'space' has
'fabric' or matter? You mentioned in other conversations that space is a
vaccuum. What is your theory (or opinion) of Dark Matter and do you agree
whether it is baryonic or non-? I've been researching this recently and
find it totally fascinating. By the way, we are all 'learning' and until
mankind has surpassed the outer reaches of the solar system, isn't it all
really just educated guesses? That's just my humble opion.... -- Kimmy

Perhaps the distance to other remote worlds sustainable of life are just
impossible for us at the moment, but that certainly doesn't suggest other
life doesn't exist! With the massive numbers of stars in our galaxy alone
multiplied by the massive numbers of galaxies out there suggests it would be
simply smug to believe we are the only ones. Life, after all, doesn't have
to be in humanoid form to be intelligent and since the technology does not
yet exist to detect planets of similar size to ours, the chances of finding
a similar planet to ours is as yet unlikely. Possible candidates include
Pegasii 51 and Upsilon Andromeda but visiting their systems is merely
science fiction at this point, let alone contacting them. Also, who is to
say that we haven't been in contact with others already? Hollywood is doing
a pretty good job of convincing us (hahaha) Anyway, to think of 20 million
years from now is a little ludicrous since we won't even be here in a
century's time or less. I wouldn't lose sleep over it. As for the
frequency of occurence of supernova, unless it happens within a few light
years of us (and I don't think there are many candidates right now) the
sheer distance would be enough time for us to atleast bend over and kiss our
butts goodbye. Perhaps by adding up the known supernova and dividing that
by the volume of the known universe and I think you'd have a better chance
of being hit by a meteorite or even a PHA (there's Hollywood again coming
out with those Deep Impact scenes!) In which case I would miss these chats
but hopefully resume them in a better place! -- Kimmy PS would the
velocity of the gas cloud of a supernova explosion expand at the speed of
light?

"Sally" wrote in message
...

"G=EMC^2 Glazier" wrote in message
...
multi-blackholes? Could supernova explosions make sure that no life in
the universe can last more than 25 million years(scary thinking) for
that only gives the life on earth about another 20 million years to go.
I'm naturally talking intelligent life. A supernova explosion in our
galaxy can show life in the galaxy how fragile it is. With only 20
million years to go I would think mankind should start thinking of
packing up and finding a safer area of the cosmos. Bert
On the subject of life, intelligent life.

Maybe the reason that we humans seem to be alone is that we are alone...at
this time. The visible universe is so vast that intelligent life has
almost
certainly evolved many times in the past. After all, it happened here so
it
is possible, given the right conditions. However...maybe intelligent life
*does* keep popping up all over and then promptly gets extinguished again
by
nearby events such as supernova explosions.

Does anybody have any guesstimates of how common these life extinguishing
events might be? Maybe it is just an unfortunate fact that they are just
as
common, or more common, than the appearance and evolution of life. I hope
not.

Sally

Hi Sally Lets say every galaxy in our universe has one intelligent
life. That is billions of billions. Still our nearest galaxy is 2
million LY away. This weird thought comes to me since I believe there
are trillions,and trillion other universes out there, What if we can
communicate with the other universes instantaneously? To take the
"iffy" part away we use gravity,as it forms worm holes connecting other
blackhole worm holes in all the other universe. Sally think of it like a
grid.(sewer system) Well you can tell I'm up to page 135 in the book
"The Universe in a Nutshell" If gravity can make communicating
instantaneous no matter what the distance my mind can really go weird..
Bert Glad Hawking's put a walnut shell on the back cover it looks just
like the human brain

Funny, I thought I asked his 'opinion' or his 'theory' not THE theory. I
find his conversations interesting. Yours are simply insults.

"Kim" wrote in message
news:nCExb.515108$9l5.56506@pd7tw2no...

"Llanzlan Klazmon The 15th" wrote in message
7.6...
(G=EMC^2 Glazier) wrote in
:

Hi Rgds I find that interesting that Venus can be seen in day
light,if you know where to look. I think I read(long time ago)
that this supernova explosion's light lasted for two weeks. Was that
the length of the explosion?
I would think being an explosion the light would
only last a second,especially since the supernova is surrounded by
just the vacuum of space.

With a type II supernova that forms a neutron star via collapse, you
have a pretty complex situation. The neutron star is very small compared
to the original star and initially will be furiously oscillating. Theory
says that these oscillations would damp out rapidly via gravitational
radiation (the LIGO experiment is currently trying to detect such
radiation from such a collapse event - no nearby type II's have occurred
since LIGO has been running though). The neutron star will also have an
enormous temperature (billions of degrees). It gets rid of a lot of this
energy by neutrino emission and eventually normal thermal radiation from
its' surface. In the mean time the outer layers of the star get blown
off by a gigantic shock wave which also causes all sorts of nuclear
reactions to take place. The debris glows brightly from thermal
radiation and it is also being pumped with additional energy from
radioactive decay. The debris doesn't reach its peak brightness in the
optical spectrum until quite a while after the actual blast. The debris
continues to glow and expand for thousands of years after the supernova.
That is why we can still see the crab nebula today.

Could these great explosions disrupt the fabric of
space? I'm working on a theory that space creates inertia,and it could
fit in here nicely. Its on the lines of Mach thinking Bert


That isn't a theory. You need to do a bit of learning.

Llanzlan.

When you say the 'fabric of space', are you infering that 'space' has
'fabric' or matter? You mentioned in other conversations that space is a
vaccuum. What is your theory (or opinion) of Dark Matter and do you agree
whether it is baryonic or non-? I've been researching this recently and
find it totally fascinating. By the way, we are all 'learning' and until
mankind has surpassed the outer reaches of the solar system, isn't it all
really just educated guesses? That's just my humble opion.... -- Kimmy

Hi Kim Well dark matter(more gravity) is needed in spiral galaxies
because they rotate very fast,and areas like our solar system(near the
edge) should be flying off into space. Since the matter we see does not
add up with enough gravity to accomplish this astronomers are looking
for matter that is invisible. Astronomers claim that over 90% of the
universe is composed of dark matter. They are looking in the sub-micro
realm,and hoping that the neutrino might have mass. Kim if you read my
"iffy" post I used motion that increases the force of inertia,and
inertia and gravity are the same. 95% of the gravity in the
universe is missing,and the universe is moving at 95% of the speed of
light. Rotational energy increases inertia(universe has lots of that.)
Motion and inertia are two side to the same coin. Its the elevator
showing the same effect as gravity. Bert