a device with which we could control the Earth’s gravity, perhaps by turning a dial.

[Denny]

----------------------- Page 136-----------------------

A star like the Sun will end its days, as we have seen, as a
red giant and then a white

dwarf. A collapsing star twice as massive as the Sun will become a
supernova and then a neutron

star. But a more massive star, left, after its supernova phase, with,
say, five times the Sun’s mass,

has an even more remarkable fate reserved for it - its gravity will
turn it into a black hole.

Suppose we had a magic gravity machine - a device with which we could
control the Earth’s

gravity, perhaps by turning a dial. Initially the dial is set at 1 g*
and everything behaves as we

have grown up to expect. The animals and plants on Earth and the
structures of our buildings are

all evolved or designed for 1 g. If the gravity were much less, there
might be tall, spindly shapes

that would not be tumbled or crushed by their own weight. If the
gravity were much more, plants

and animals and architecture would have to be short and squat and
sturdy in order not to collapse.

But even in a fairly strong gravity field, light would travel in a
straight line, as it does, of course,

in everyday life.



* 1 g is the acceleration experienced by falling objects on
the Earth, almost 10 meters per second every

second. A falling rock will reach a speed of 10 meters per second
after one second of fall, 20 meters per second after

two seconds, and so on until it strikes the ground or is slowed by
friction with the air. On a world where the

gravitational acceleration was much greater, falling bodies would
increase their speed by correspondingly greater

amounts. On a world with 10 g acceleration, a rock would travel 10 x
10 m/sec or almost 100 m/sec after the first

second, 200 m/sec after the next second, and so on. A slight stumble
could be fatal. The acceleration due to gravity

should always be written with a lowercase g, to distinguish it from
the Newtonian gravitational constant, G, which is

a measure of the strength of gravity everywhere in the universe, not
merely on whatever world or sun we are

discussing. (The Newtonian relationship of the two quantities is F =
mg = GMm/r2 2

;
g = GM/r , where F is the

gravitational force, M is the mass of the planet or star, m is the
mass of the falling object, and r is the distance from

the falling object to the center of the planet or star.)



Consider a possibly typical group of Earth beings, Alice and
her friends from Alice in

Wonderland at the Mad Hatter’s tea party. As we lower the gravity,
things weigh less. Near 0 g

the slightest motion sends our friends floating and tumbling up in the
air. Spilled tea - or any

other liquid - forms throbbing spherical globs in the air: the surface
tension of the liquid

overwhelms gravity. Balls of tea are everywhere. If now we dial 1 g
again, we make a rain of tea.

When we increase the gravity a little - from 1 g to, say, 3 or 4 g’s -
everyone becomes

immobilized: even moving a paw requires enormous effort. As a kindness
we remove our friends

from the domain of the gravity machine before we dial higher gravities
still. The beam from a

lantern travels in a perfectly straight line (as nearly as we can see)
at a few g’s, as it does at 0 g.

At 1000 g’s, the beam is still straight, but trees have become
squashed and flattened; at 100,000

g’s, rocks are crushed by their own weight. Eventually, nothing at all
survives except, through a

special dispensation, the Cheshire cat. When the gravity approaches a
billion g’s, something still

more strange happens. The beam of light, which has until now been
heading straight up into the

sky, is beginning to bend. Under extremely strong gravitational
accelerations, even light is

affected. If we increase the gravity still more, the light is pulled
back to the ground near us. Now

the cosmic Cheshire cat has vanished; only its gravitational grin
remains.

When the gravity is sufficiently high, nothing, not even
light, can get out. Such a place is

called a black hole. Enigmatically indifferent to its surroundings, it
is a kind of cosmic Cheshire

cat. When the density and gravity become sufficiently high, the black
hole winks out and

disappears from our universe. That is why it is called black: no light
can escape from it. On the

inside, because the light is trapped down there, things may be
attractively well-lit. Even if a black

hole is invisible from the outside, its gravitational presence can be
palpable. If, on an interstellar

voyage, you are not paying attention, you can find yourself drawn into
it irrevocably, your body

stretched unpleasantly into a long, thin thread. But the matter
accreting into a disk surrounding

[newgirlf...@gmail.com]

[greengra...@gmail.com]

alt.satanism ›

a device with which we could control the Earth’s gravity, perhaps by turning a dial.

On Friday, June 29, 2012 at 2:27:20 PM UTC-7, Denny wrote:

[Dennis Garrett]

good

On Friday, June 29, 2012 at 2:27:20 PM UTC-7, Denny wrote:

[Dennis Garrett]

good On Friday, June 29, 2012 at 2:27:20 PM UTC-7, Denny wrote:

[Denny Garrett]

good
ffff

[Denny Garrett]

good

On Friday, June 29, 2012 at 2:27:20 PM UTC-7, Denny wrote:

[Denny Garrett]

[Denny Garrett]

ggg

On Friday, June 29, 2012 at 2:27:20 PM UTC-7, Denny wrote:

[newgirlf...@gmail.com]

good

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Denny
Jun 29, 2012, 2:27:20 PM
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ffff

[newgirlf...@gmail.com]

good

[newgirlf...@gmail.com]

[Dennis Garrett]

good

[Dennis Garrett]

good