3 earth like planets discovered.


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Message 1358206 - Posted: 18 Apr 2013, 18:46:39 UTC

http://www.cnn.com/2013/04/18/us/planet-discovery/index.html

You won't be swimming on the planets anytime soon, though. The Kepler-62 star is 1,200 light years away; Kepler-69 is 2,700 light years away. A light year, the distance that light travels in a vacuum in one year, is nearly 6 trillion miles.


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Message 1358211 - Posted: 18 Apr 2013, 18:52:56 UTC

Awesome! Three more good candidates for the Green Bank project to look at... er... when it finally gets going more than a preliminary search. :^)
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Message 1358289 - Posted: 18 Apr 2013, 21:32:02 UTC

This is all well and good. I only hope it inspires someone to invent a way around the light speed limit. If that doesn't happen it is all academic except for the possibility of building an Ark ship to keep human life going in the face of an earth destroying event. The problem there being that the humans who arrive at their destination will be totally adapted to living on a ship in space and most likely not bear much in common with their ancestors.
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Message 1359143 - Posted: 21 Apr 2013, 1:23:24 UTC - in response to Message 1358289.
Last modified: 21 Apr 2013, 1:25:31 UTC

I think that we must be careful when the phrase "Earth-like planet" is used. Earth like in what way or ways. i surmise that some 20 or more parameters would have to be in narrow ranges to be considered "Earth-Like". I posit that we will never find another Earth -like planet. They are out there but way too far away. I would like my intuition to be proven wrong.

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Message 1359466 - Posted: 21 Apr 2013, 18:28:47 UTC - in response to Message 1358289.
Last modified: 21 Apr 2013, 18:30:07 UTC

This is all well and good. I only hope it inspires someone to invent a way around the light speed limit. If that doesn't happen it is all academic except for the possibility of building an Ark ship to keep human life going in the face of an earth destroying event. The problem there being that the humans who arrive at their destination will be totally adapted to living on a ship in space and most likely not bear much in common with their ancestors.

There must be something yet to be discovered that can defy the speed of light
limitations when used to construct a body. A body as such that when travelling
can attain virtually any speed it likes.
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Message 1359501 - Posted: 21 Apr 2013, 19:32:20 UTC

Einstein says that at the speed of light mass becomes infinite, and therefore requires an infinite amount of energy to move it. To go faster than light speed we would in theory need negative mass. i.e. a ship built out of tachyons.

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Message 1359508 - Posted: 21 Apr 2013, 19:55:58 UTC - in response to Message 1359466.

This is all well and good. I only hope it inspires someone to invent a way around the light speed limit. If that doesn't happen it is all academic except for the possibility of building an Ark ship to keep human life going in the face of an earth destroying event. The problem there being that the humans who arrive at their destination will be totally adapted to living on a ship in space and most likely not bear much in common with their ancestors.

There must be something yet to be discovered that can defy the speed of light
limitations when used to construct a body. A body as such that when travelling
can attain virtually any speed it likes.

I too hope that there is a way to get around the light speed problem but I don't think such a means is guaranteed to be within our grasp.
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Message 1359511 - Posted: 21 Apr 2013, 20:33:30 UTC
Last modified: 21 Apr 2013, 20:35:24 UTC

Oh, you say an planet orbiting another solar system is Earth like because it is having liquid water on its surface?

We already know about a giant stone planet which is so far away from its mother star that it is readily visible using http://wwww.sky-map.org.

And it is not a brown dwarf either, as far as I know it.

Still we do not think that such a stone planet is Earth like at all.

Why not? Is something more or else missing (like an atmosphere?)

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Message 1359605 - Posted: 22 Apr 2013, 1:10:24 UTC - in response to Message 1359508.

We will not travel at any speed approaching or exceeding the speed of light

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Message 1359614 - Posted: 22 Apr 2013, 1:48:58 UTC - in response to Message 1359605.

That is correct, we will not go that fast. In the future it is unlikely also.
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Message 1359619 - Posted: 22 Apr 2013, 1:57:39 UTC - in response to Message 1359501.

Einstein says that at the speed of light mass becomes infinite, and therefore requires an infinite amount of energy to move it. To go faster than light speed we would in theory need negative mass. i.e. a ship built out of tachyons.


What's known about anti-matter and it's relationship to the speed of light
equation?


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Message 1359697 - Posted: 22 Apr 2013, 7:02:51 UTC

Antimatter is essentially identical to normal matter (in terms of underlying physics) except that certain properties have the opposite sign. Mass is *not* one of those properties - antiprotons and protons have the same mass, as do electrons and positrons, etc.

The sign change may sound like it's really different (and to a certain extent, it is), but we can use the same math analysis to figure out what antiparticles will do. In that regard, the physics isn't different.

The idea of negative mass seems unlikely given our current understanding of the relationship between matter and mass (of which the Higgs boson is the latest news). What could be very interesting is figuring out a better relationship between mass and gravity. Currently, the best we have is Einstein's theory of General Relativity, which is a more powerful form of Newton's Universal Gravitation. However, Relativity completely fails to describe gravity at quantum-scales (really, *really* small).

The laws of physics must work in any frame of reference. That is one of the tenets of physics. The fact that General Relativity has problems with the really small scale indicates there may be some important stuff there. What we find, though, is anyone's guess.

To address your question regarding

...it's relationship to the speed of light equation?

the equation a lot of people know and love is:
E=m*c2

where E is the total energy, m is the mass of the particle, and c is the speed of light.

However, this only describes a particle at rest. The equation for the total energy of a particle moving at speeds getting close to the speed of light is:
E=gamma*m*c2

where gamma = 1/( square_root( 1 - v2/c2 ) ).

As v increases closer to c, gamma gets bigger and bigger, approaching infinity. Since we can't have infinite energy, we can never make anything with mass travel at the speed of light according to Einstein's theory of Special Relativity. All our observations support Special and General Relativity, so most physicists are pretty confident in saying that it's right, and all physicists will say that it is the best model that we have for gravity.

That was a fun tangent. Regarding the original post, I'm really happy to see Kepler performing according to specs and getting due attention.

"Future NASA missions are going to focus on more nearby stars that we can look at in much more detail," Barclay said.


Yay! It's about time we take a closer look at our own neighborhood.
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Message 1359759 - Posted: 22 Apr 2013, 10:55:41 UTC
Last modified: 22 Apr 2013, 11:11:27 UTC

never understood why they never sent some new 'Voyagers with todays technologies' towards our neighbors yet. i m pretty sure they would be already further than the old ones.

but...

another thing.

if happends we 'cant escape' a solar system ? (it always throttled in my mind)..
if you take the very ecliptical planets, or even the comets, they arrive with speed, attracted by the sun, and then turn around, and be propulsed with high speed toward the exit of our system. and then, they likely stop their courses and ....comeback !
and why they comeback ? they should pass the voyagers like a sprinter passing by an old woman with her cane !
Why it stops and comeback ? gravity of the sun ? and why this gravity doesnt apply to the voyagers or any spaceship ?

Why its different ?
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Message 1359770 - Posted: 22 Apr 2013, 11:14:19 UTC - in response to Message 1359143.
Last modified: 22 Apr 2013, 11:18:00 UTC

I think that we must be careful when the phrase "Earth-like planet" is used. Earth like in what way or ways. i surmise that ...

... there be good material there for some very good Daddio Science ;-)


Keep searchin',
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Message 1359772 - Posted: 22 Apr 2013, 11:28:31 UTC

I think that we must be careful when the phrase "Earth-like planet" is used.

That is being used to describe a planet in the "habitable zone" around a star. Not too cold or too hot, enough to have water to have life as we know it. That maybe is our mistake. There could be other life not as we know it. Shades of Dr. McCoy.

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Message 1359773 - Posted: 22 Apr 2013, 11:32:46 UTC

Voyager will keep going because it got a speed increase from a few of the planets gravity assist it's called.
Most comets slow down by the time they are at Jupiter or Saturn so do not have enough speed to go beyond the ord cloud i'm shore others will explain it better
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Message 1359783 - Posted: 22 Apr 2013, 11:57:07 UTC - in response to Message 1359759.

never understood why they never sent some new 'Voyagers with todays technologies' towards our neighbors yet. i m pretty sure they would be already further than the old ones.


Mostly we are stuck with chemical rockets, and speeds similar to what the Voyagers are doing, and Glenn is somewhat correct. We did use gravity boost, but with specific trajectories to get them heading out of the solar system.

Even at extreme energy levels, whether it is the formation or feeding of black holes, or the results of the extreme collisions of particle accelerators, there is no evidence that something could travel faster than light. One of the more promising long term solutions is
Ion Drive. Even that has it's limits due to the very low thrust.

With such puny thrust, a NEXT-based ion drive would need to run for 10,000 hours — just over a year — to reach a suitable speed for space travel. Dawn, a NASA probe that’s powered by previous-generation NSTAR ion thrusters, accelerated from 0 to 60 mph in four days. As a corollary, ion thrusters only work at all because of the near-vacuum of space; if there was any friction at all, like here on Earth, an ion drive would be useless. The good news, though, is that the (eventual) max speed of a spacecraft propelled by an ion drive is in the region of 200,000 miles per hour (321,000 kph).


The efficiency is really much better than chemical rockets, but even at maximum speed, it is not even close to light speed.

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Message 1360122 - Posted: 23 Apr 2013, 2:07:24 UTC

Oh, 1/0 = ∞

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Message 1360174 - Posted: 23 Apr 2013, 5:11:55 UTC - in response to Message 1360122.

Oh, 1/0 = ∞

Well that's true, but what has it to do with the current discussion??
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Message 1360205 - Posted: 23 Apr 2013, 5:46:57 UTC - in response to Message 1360174.

Oh, 1/0 = ∞

Well that's true, but what has it to do with the current discussion??


Less than the square root of nothing.
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