goligoth said:In physic gravity is -9.8 meters/sec so they obviously found some way to measure it...
goligoth said:Why arn't the planets pulled into one another?
Each one has it's own gravity and the sun is tugging on all of them.
I would think that the gravity of every planet would effect every other planet just a little...but enough to alter its course over time.
Is the sun really balancing us out that well?
And if gravity is the attraction force between two masses then isn't it really really bad to be sending out ships and satellites?
By doing so we are changing the mass of the earth and given enough launches and enough time our gravity will have changed just enough so that we would be pulled into the sun or (much scarier) thrown away from the sun.
Again these are questions that I posed to people like my physics teacher and I was either shrugged away or given a really stupid answer. :2brickwal
goligoth said:Why arn't the planets pulled into one another?
goligoth said:Each one has it's own gravity and the sun is tugging on all of them.
I would think that the gravity of every planet would effect every other planet just a little...but enough to alter its course over time.
goligoth said:Is the sun really balancing us out that well?
goligoth said:And if gravity is the attraction force between two masses then isn't it really really bad to be sending out ships and satellites? By doing so we are changing the mass of the earth and given enough launches and enough time our gravity will have changed just enough so that we would be pulled into the sun or (much scarier) thrown away from the sun.
As for satellites, you can basically think of them as part of the earth since they are still in the vicinity and were made from materials that came from the earth. But aside from that, the same thing applies to them as applies for spaceships: their mass is miniscule.
goligoth said:Satelittes aren't part of the earth.
goligoth said:they tug on earth's gravity so wouldn't they detract doubly from it's gravity...once for leaving, twice for tugging.
goligoth said:..again as many people redundantly pointed out it's not a lot but earth's rotation has remained 'unchanged' just as its mass has remained unchanged. Enough space ships and satelittes and in a couple million years of doing so...:boohoo: ... the people of "not tommorow but the day after" might want to look out!
goligoth said:So common asteroids n' such have gravity too?
goligoth said:Why wouldn't they just compress themselves into a giaganto asteroid?
Kandahar said:Yes. All matter has gravity.
Generally they don't weigh very much (relative to other heavenly bodies) and therefore their gravity isn't strong enough to significantly alter one another. In fact, the main difference between an asteroid and a moon/planet is that the former is not spherical because its gravity is so weak.
goligoth said:What is anti-matter then?
goligoth said:And an asteroid belt has many asteroids. Millions upon millions of rocks floating around and playing cards. Eventually they create an alliance and turn into a planet.
goligoth said:But why aren't all centers of mass drawn to a central point? they've had a really really long time to do so( so long of a time span that I don't even know how many years). If maybe not compacted into a central mass then they should at least show signs of moving to it...shouldn't they?
alphieb said:Scientist think gravity is bent space....but how???? What creates bent space?????
Kandahar said:Antimatter is just like regular matter, but with the charges reversed. The positive-charged antiparticles (positrons) orbit the nucleus, and the negative-charged antiparticles (negatrons) are inside the nucleus, which is the opposite of regular matter.
But as far as gravity goes, matter and antimatter behave the same.
The Real McCoy said:Which brings up another interesting topic: dark matter.
While normal matter & anti-matter share the same gravitational properties, the mysterious dark matter produces a sort of anti-gravity which shapes the grander structures in the universe.
Dark matter has yet to be directly observed but it's visible effects are profound. Our own galaxy is comprised of mostly dark matter, some astronomers estimate that over 90% of the mass of our galaxy is in the form of dark-matter.
goligoth said:You said that asteroids and such are held more firmly by the sun then being attracted into one another. What holds the suns in rotation and keeps them from being pulled to one another?
goligoth said:I haven't heard anything about that dark energy stuff...is that what our scientists are calling black holes or are those still undefined?
George_Washington said:Einstein said that gravity is the result of objects being distorted in a thing called, "space-time" with the largest distortions occuring with objects of great mass.
That's about all I know...lol
dragonslayer said:lol without Gravity things would be grave. We would be floating in space and have to use hooks on our feet to stay on earth.
goligoth said:If light, mass, and even time can not escape the event horizon then how are we able to measure black holes? How can we have any viable guess?
Thank you for the dark energy dark matter links they're informative.
goligoth said:So common asteroids n' such have gravity too? Why wouldn't they just compress themselves into a giaganto asteroid?
Thinker said:In the absence of other forces, self gravity would tend to make collections of
smaller bodies combine into larger ones; that's how stars and planets form.
In the case of the solar system's asteriod belt, there are other effects that act
against this, the most significant being Jupiter's gravity. Gravitational forces
from the combination of Jupiter and the Sun are large enough to keep stirring
things and prevent the formation of another planet between Mars and Jupiter.
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