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Science Forum Index » Astronomy Forum » Why do earth not Fall on Sun?
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| Jeff▲Relf |
 Posted: Sun Apr 27, 2008 1:35 pm |
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Eric Gisse is not Dirk.
Gisse is an undergraduate in Fairbanks Alaska ( see NNTP-Posting-Host )
and Dirk is in Brussels, Belgium: “ dD577AB19.Access.TeleNet.BE ”.
( news:4bVVe.193776$5o3.10547329@phobos.telenet-ops.be )
I think Gisse is currently in Seattle ( my town ) for a job interview. |
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| G=EMC^2 Glazier |
| Posted: Sun Apr 27, 2008 1:54 pm |
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Its less energy for the Earth to fall into the Oort belt,than for the
Sun's gravity to have it fALL IN TO IT. gO FIUGURE Bert |
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| turtoni |
| Posted: Sun Apr 27, 2008 2:08 pm |
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| Ed |
| Posted: Sun Apr 27, 2008 2:14 pm |
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On Apr 27, 11:25am, SolomonW <Solom...@DONTBOTHER.com> wrote:
Quote: In article <5b19dda4-0956-4950-86a6-
75e6a367b...@r66g2000hsg.googlegroups.com>, solon...@earthlink.net
says...
On Apr 27, 3:53am, Sanny <softta...@hotmail.com> wrote:
When Sun and Earth are attracting each other why do Earth not fall on
Sun.
When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at:http://www.getclub.com/Discussion.php
This is a deep question. It goes right to the heart of why gravity
and space behave the way they do. As posted above, Newton and
Einstein have given us mathematical models of *how* gravity and space
behave but not *why*.
Agreed
The only answer that comes to mind is the
anthromorphic principle, which seems to me to be not quite satisfying.
How would an anthromorphic principle helps here?- Hide quoted text -
- Show quoted text -
From Wikipedia "In physics and cosmology, the anthropic principle
states that humans should take into account the constraints that human
existence as observers imposes on the sort of universe that could be
observed. In other words, the only universe we can see is one that
supports life. If it were a different type of universe, we would not
exist to see it." |
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| Ed |
| Posted: Sun Apr 27, 2008 2:15 pm |
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On Apr 27, 12:03pm, Mike <elea...@yahoo.gr> wrote:
Quote: On Apr 27, 10:29am, Ed <solon...@earthlink.net> wrote:
On Apr 27, 3:53am, Sanny <softta...@hotmail.com> wrote:
When Sun and Earth are attracting each other why do Earth not fall on
Sun.
When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at:http://www.getclub.com/Discussion.php
This is a deep question. It goes right to the heart of why gravity
and space behave the way they do. As posted above, Newton and
Einstein have given us mathematical models of *how* gravity and space
behave but not *why*. The only answer that comes to mind is the
anthromorphic principle, which seems to me to be not quite satisfying.- Hide quoted text -
- Show quoted text -
Do you need to know why to send a sat in orbit?
Mike- Hide quoted text -
- Show quoted text -
No, although the people fronting the money might need to know why. |
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| Ed |
| Posted: Sun Apr 27, 2008 2:20 pm |
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On Apr 27, 12:09pm, Sam Wormley <sworml...@mchsi.com> wrote:
Quote: Ed wrote:
This is a deep question. It goes right to the heart of why gravity
and space behave the way they do. As posted above, Newton and
Einstein have given us mathematical models of *how* gravity and space
behave but not *why*.
Given the way the universe is the why is pretty well answered by GTR.
But isn't that just what Sanny is questioning? Why is the Universe the
way it is?
GTR looks like how; it spells out the rules, why are those the rules
instead of some other rules.
Maybe the rules are the only possible rules for any Universe, but
that's certainly never been conclusively established. |
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| Immortalist |
| Posted: Sun Apr 27, 2008 2:36 pm |
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On Apr 27, 12:53am, Sanny <softta...@hotmail.com> wrote:
Quote: When Sun and Earth are attracting each other why do Earth not fall on
Sun.
It is going to fast sideways next to it. Actually earth is constantly
falling into the sun but it needs to go slower to fall into it or even
faster to fly off into space further away from it.
In physics, escape velocity is the speed where the kinetic energy of
an object is equal to the magnitude of its gravitational potential
energy... It is commonly described as the speed needed to "break free"
from a gravitational field. The term escape velocity can be considered
a misnomer because it is actually a speed rather than a velocity, i.e.
it specifies how fast the object must move but not in which direction.
http://en.wikipedia.org/wiki/Escape_velocity
http://youtube.com/watch?v=PQ1FmugLm88
http://youtube.com/watch?v=QKnwYiqlTAE
http://youtube.com/watch?v=7cikYZQNIus
http://youtube.com/watch?v=iODccWH8AgU
http://youtube.com/watch?v=hzdomHMTDCo
http://youtube.com/watch?v=aoIsD--_oQU
http://youtube.com/watch?v=56QCI4Ig4EY
http://youtube.com/watch?v=qkbyIfGgOiY
The centripetal force is the external force required to make a body
follow a circular path at constant speed (speed being the magnitude of
velocity). Hence centripetal force is a force requirement, not a
particular kind of force. Any force (gravitational, electromagnetic,
etc.) can act as a centripetal force. The force is directed inward,
toward the center of the circle or "oriented toward the axis of
rotation." The term centripetal force comes from the Latin words
centrum ("center") and petere ("tend towards", "aim at."), and can
also be derived from Isaac Newton's original definitions described in
Philosophiae Naturalis Principia Mathematica.
The centripetal force always acts perpendicular to the direction of
motion of the body. In the case of an object that moves along a
circular arc with a changing speed, the net force on the body may be
decomposed into a perpendicular component that changes the direction
of motion (the centripetal force), and a parallel, or tangential
component, that changes the speed.
Centripetal force should not be confused with centrifugal force
http://en.wikipedia.org/wiki/Centripetal_force
http://en.wikipedia.org/wiki/Reactive_centrifugal_force
Quote: When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at:http://www.getclub.com/Discussion.php |
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| Jeff▲Relf |
| Posted: Sun Apr 27, 2008 3:08 pm |
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In oh-so-very-human 3-D,
the earth's orbit has angular momentum and “ action ” is conserved;
not so in the ( unimaginable ) 4-D world that's intrinsic to nature.
The earth is moving in a staight line.. but spacetime is curved.
The spacetime continuum is also known as hyperspace,
i.e. the 4-D gravitational field, a hyperstructure.
Randomness is ignorance, nothing more.
When a system is fully known it can be modeled in 4-D;
otherwise its a 3-D model or ( worse ) a statistical model.
For some light reading on this topic see
this philosophical novel about World War II and 4-D hyperspace:
“ Slaughterhouse-Five;
or, The Children's Crusade: A Duty-Dance With Death ”.
Einstein said:
“ I see a pattern,
but my imagination cannot picture the maker of that pattern.
I see a clock, but I cannot envision the clockmaker.
The human mind is unable to conceive of the four dimensions,
so how can it conceive of a God,
before whom a thousand years and a thousand dimensions are as one ? ”.
-- “ The Expanded Quotable Einstein ”,
Princeton University Press, 2000 Page 208
Petkov ( 2005 ) has this to say:
“ This paper pursues two aims.
First, to show that the block universe view, regarding the universe as
a timelessly existing four-dimensional world,
is the only one that is consistent with special relativity.
Second, to argue that special relativity alone can resolve
the debate on whether the world is
three-dimensional or four-dimensional.
The argument advanced in the paper is that
if the world were three-dimensional
the kinematic consequences of special relativity and more importantly
the experiments confirming them would be impossible. ”.
-- “ Is There an Alternative to the Block Universe View ? ”
http://Philsci-Archive.Pitt.EDU/archive/00002408/
From Einstein's, " Ether and the Theory of Relativity " ( 1920 )
quoted at " http://TUHH.DE/rzt/rzt/it/Ether.html ":
" But this ether may not be thought of as
endowed with the quality characteristic of ponderable media,
as consisting of parts which may be tracked through time.
The idea of motion may not be applied to it. ". |
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| Uncle Al |
| Posted: Sun Apr 27, 2008 3:36 pm |
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| John Jones |
| Posted: Sun Apr 27, 2008 5:04 pm |
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Joined: 26 Oct 2004
Posts: 4263
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Sanny wrote:
Quote: When Sun and Earth are attracting each other why do Earth not fall on
Sun.
When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at: http://www.getclub.com/Discussion.php |
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| John Jones |
| Posted: Sun Apr 27, 2008 5:50 pm |
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Joined: 26 Oct 2004
Posts: 4263
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Sanny wrote:
Quote: When Sun and Earth are attracting each other why do Earth not fall on
Sun.
When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at: http://www.getclub.com/Discussion.php |
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| Robert J. Kolker |
| Posted: Sun Apr 27, 2008 6:25 pm |
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flamestar wrote:>
Quote: Not true the earth does not have an elliptical orbit because it
wobbles in its orbit. You are a person who so hates the truth that you
seek to prevent people from understanding scientific principles by
bring up irrelevant details. The world is an evil place because you
are in it.
In any case the earth orbit is not circular.
Bob Kolker |
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| Mark Earnest |
| Posted: Sun Apr 27, 2008 8:49 pm |
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The Earth does not fall into the Sun because it is constantly accelerating
at a right angle to the Sun.
"Sanny" <softtanks@hotmail.com> wrote in message
news:91fc07f0-5c11-4056-a817-bbb10ff28f61@j33g2000pri.googlegroups.com...
Quote: When Sun and Earth are attracting each other why do Earth not fall on
Sun.
When we throw a big Stone in air It will Fall Back on Earth.
Simmilarly For Sun Earth is just a piece of Rock? Who do this big rock
Earth Fall onto the Sun Just like the Stones which we throw in air
just come back and hit the Earth?
Simmilarly why not the Moon fall on Earth by the Gravity attration?
Why are the planets revolving round the sun for so many years instead
of just falling onto the Sun?
When we visit Moon on a Rocket Our Rocket Just Falls on Surface of
moon So why these heavenly bodies not falling on Bigger one?
Bye
Sanny
Extreme Discussions at: http://www.getclub.com/Discussion.php |
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| Sam Wormley |
| Posted: Sun Apr 27, 2008 9:00 pm |
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Mark Earnest wrote:
Quote: The Earth does not fall into the Sun because it is constantly accelerating
at a right angle to the Sun.
Whoops! The force (gravity) is directed toward the sun and hence the
acceleration is directed toward the sun. |
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| Mark Earnest |
| Posted: Sun Apr 27, 2008 10:15 pm |
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"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:jdaRj.139437$yE1.67749@attbi_s21...
Quote: Mark Earnest wrote:
The Earth does not fall into the Sun because it is constantly
accelerating
at a right angle to the Sun.
Whoops! The force (gravity) is directed toward the sun and hence the
acceleration is directed toward the sun.
Whoops yourself. If the acceleration was all toward the Sun, the planet
would fall into the Sun, just as the OP perceives.
It is the right angel acceleration that keeps the planet from falling into
the Sun. |
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