Planet Hunters Report Record-Breaking Discovery, Search for other habitable planets

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KLiK
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Message 1634982 - Posted: 30 Jan 2015, 11:42:49 UTC - in response to Message 1634078.  

I'm afraid a lot of what is being reported as facts about exo-planets is more like educated guesswork.

Well, you can see those from articles on NASA web site:
- planet is probably stone based
- super Earth might be stone or gas giant...

All others scripts are not scientific...and tend to go a little (or more) to the Yellow press... ;)


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Message 1635196 - Posted: 30 Jan 2015, 19:48:14 UTC - in response to Message 1384657.  

these planets are predicted planets that are so far away they are lost in the stars glare. Many are so hot they could never hold life.
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Message 1635429 - Posted: 31 Jan 2015, 1:17:55 UTC - in response to Message 1635196.  

these planets are predicted planets that are so far away they are lost in the stars glare. Many are so hot they could never hold life.


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Message 1635688 - Posted: 31 Jan 2015, 13:47:24 UTC

7 lightyears = 66,224,900,000,000,000 meters
1 lightyear = 9.4607 x (10^15) = 9,460,700,000,000,000 meters

traveling at 22,000mph (849,733,632 meters per day)
we could send a craft to the area in

77,936,070.206057231826737911204626 days

or simply 213,523.5 years.

How fast would a spacecrat have to travel to make it there in a human lifetime?
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Message 1635749 - Posted: 31 Jan 2015, 17:27:39 UTC - in response to Message 1635688.  

7 lightyears = 66,224,900,000,000,000 meters
1 lightyear = 9.4607 x (10^15) = 9,460,700,000,000,000 meters

traveling at 22,000mph (849,733,632 meters per day)
we could send a craft to the area in

77,936,070.206057231826737911204626 days

or simply 213,523.5 years.

How fast would a spacecrat have to travel to make it there in a human lifetime?

Somewhere well beyond the speed of light. And if it returned to earth thousands of years would have passed.
Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.
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Message 1637719 - Posted: 5 Feb 2015, 12:22:02 UTC

Well, i did a bit of math to figure out a speed to which a craft would have to travel to reach a planet 25ly away, to make it in ~15 earth years.

15 years = 131,487 hours
25 ly = 146,965,000,000,000 miles

we would need to travel 1,117,715,059.2834272589685672347837 mph to make it in 15 years without hitting anything.

Would anything survive at that speed. We would need to build a multi stage rocket in space, launch it from space (away from gravity), and figure out a way to slow it down so we dont fly by the planet. Probably by a rocket stage or two. Not to mention two mega radios, one on earth, one on the rocket, so we could communicate with it.

It's doable, lets get a kickstarter going to fund it and have it powered by model rocket engines, hey thrust is thrust and they are cheep, well most are :) lol
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Message 1637731 - Posted: 5 Feb 2015, 13:07:19 UTC - in response to Message 1635688.  

7 lightyears = 66,224,900,000,000,000 meters
1 lightyear = 9.4607 x (10^15) = 9,460,700,000,000,000 meters

traveling at 22,000mph (849,733,632 meters per day)
we could send a craft to the area in

77,936,070.206057231826737911204626 days

or simply 213,523.5 years.

How fast would a spacecrat have to travel to make it there in a human lifetime?

A human lifetime = let's say a "human working life time" of 50 years.
So that means each half of a round trip needs to take 25 years.
Thus, making no allowances for acceleration and deceleration that is (7/25)C
(Where C = speed of light).
So putting in the figures we get our space craft needs to average 302,190,840km/h - which is cracking on in anyone's book, but not several times the speed of light, so doable, just needs a massive amount of energy to do it.
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Message 1637747 - Posted: 5 Feb 2015, 14:06:47 UTC - in response to Message 1637719.  

That's 1.6 times the speed of light, not doable as of today. And still many hundreds of years on earth would have passed by the time the astronauts returned to earth.
Bob DeWoody

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Message 1637754 - Posted: 5 Feb 2015, 14:55:14 UTC

Sorry Bob, 7/25C is between one quarter and one third the speed of light.
I think folks are getting confused by doing too many units conversions early in problem - leave it until the end and its a much easier sum.


Let's look it simply, instead of doing early conversions:

You want to travel somewhere 7 light years away.
You want to get there in 25 years.
Speed = distance / time

Distance is 7 light years
Time is 25 years

so speed = 7 / 25

And then change C into whatever units yo want to use.
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Message 1642513 - Posted: 15 Feb 2015, 19:42:25 UTC - in response to Message 1637754.  

We are going to need a map, to find these exoplanets .

Newly Discovered Exoplanet With Extreme Seasons Called A 'Real Maverick'

Two groups of astronomers working independently in Germany have discovered a massive new exoplanet that's quite strange--for a few reasons.

The newfound exoplanet, dubbed Kepler-432b, was monitored by NASA's Kepler space telescope from 2009 to 2013 and identified as a planetary candidate in 2011. Using the 2.2-meter telescope at Calar Alto Observatory in Andalucía, Spain and the Nordic Optical Telescope on La Palma in the Canary Islands, the researchers are now confirming that, indeed, it's a planet.

(Story continues below image.)

http://www.huffingtonpost.com/2015/02/15/kepler-432b-exoplanet-extreme-seasons_n_6672378.html
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Message 1642520 - Posted: 15 Feb 2015, 20:02:55 UTC - in response to Message 1635688.  
Last modified: 15 Feb 2015, 20:03:35 UTC

7 lightyears = 66,224,900,000,000,000 meters
1 lightyear = 9.4607 x (10^15) = 9,460,700,000,000,000 meters

traveling at 22,000mph (849,733,632 meters per day)
we could send a craft to the area in

77,936,070.206057231826737911204626 days

or simply 213,523.5 years.

How fast would a spacecrat have to travel to make it there in a human lifetime?


The underlined is the initial question. The answer is simply, the speed of light in 7 years. Maybe future techology, using nuclear power, will make this possible......
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Message 1642685 - Posted: 16 Feb 2015, 2:26:49 UTC - in response to Message 1642520.  

The underlined is the initial question. The answer is simply, the speed of light in 7 years. Maybe future techology, using nuclear power, will make this possible......
____________

No even if light speed were possible it would take a lot of time to accelerate to that speed.
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Message 1642758 - Posted: 16 Feb 2015, 7:22:29 UTC - in response to Message 1642685.  

The underlined is the initial question. The answer is simply, the speed of light in 7 years. Maybe future techology, using nuclear power, will make this possible......
____________

No even if light speed were possible it would take a lot of time to accelerate to that speed.


I remembered project Orion over night:

http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propulsion%29

We still have a lot to learn when it comes to nuclear propulsion.
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Message 1649635 - Posted: 5 Mar 2015, 18:01:16 UTC - in response to Message 1642758.  

Just 136 light-years away.

Massive Exoplanet Evolved in Extreme 4-Star System

For only the second time, an exoplanet living with an expansive family of four stars has been revealed.

The exoplanet, which is a huge gaseous world 10 times the mass of Jupiter, was previously known to occupy a 3-star system, but a fourth star (a red dwarf) has now been found, revealing quadruple star systems possessing planets are more common than we thought.

http://news.discovery.com/space/alien-life-exoplanets/massive-exoplanet-evolved-in-extreme-4-star-system-150304.htm
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Message 1649650 - Posted: 5 Mar 2015, 19:00:22 UTC - in response to Message 1649635.  

Just 136 light-years away.

Massive Exoplanet Evolved in Extreme 4-Star System

For only the second time, an exoplanet living with an expansive family of four stars has been revealed.

The exoplanet, which is a huge gaseous world 10 times the mass of Jupiter, was previously known to occupy a 3-star system, but a fourth star (a red dwarf) has now been found, revealing quadruple star systems possessing planets are more common than we thought.

http://news.discovery.com/space/alien-life-exoplanets/massive-exoplanet-evolved-in-extreme-4-star-system-150304.htm


Beautiful slideshow! Thanx for the link Lynn:)
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Message 1650262 - Posted: 7 Mar 2015, 9:02:18 UTC - in response to Message 1642685.  

The Relativistic Rocket at the Physics FAQ posits an engine that can provide enough thrust for the occupants to experience a constant one-gee acceleration. (Ignoring practical considerations of fuel, collision avoidance, &c., of course!) Halfway to the destination you turn the ship around, and brake at one gee the rest of the way so as to arrive at a low speed.

Plugging a destination 7 light-years away into the formulæ given there, I get the following:

  • According to shipboard clocks, it‘s 2.14 years to turnaround (3.5 LY).
  • At that point the ship’s speed is 97.6% the speed of light.
  • It arrives after 4.28 years of travel. It receives a congratulatory message from Earth that was sent 7 years previously, but dated 1.72 years after the ship’s departure.
  • The travellers return to Earth 8.56 years older (plus the time spent at the destination), to find that 17.45 (plus) years have passed for everyone else.


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Message 1650283 - Posted: 7 Mar 2015, 11:43:19 UTC - in response to Message 1384657.  
Last modified: 7 Mar 2015, 11:51:23 UTC

Latest news (6 March 2015):
Astronomers believe mysterious signals - previously dismissed as stellar bursts - are coming from an Earth-like planet.
The Gliese 581d planet has conditions that could support life, and is likely to be a rocky world, twice the size of Earth.
Signals from the planet were initially discovered in 2010, but last year dismissed as noise from distant stars.


http://www.dailymail.co.uk/sciencetech/article-2983202/Alien-noise-Earth-like-world-Mystery-signals-suggest-habitable-planet-exists-22-light-years-away.html
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Message 1650943 - Posted: 9 Mar 2015, 8:44:10 UTC - in response to Message 1650283.  
Last modified: 9 Mar 2015, 8:44:28 UTC

A 22-LY round trip would take somewhat over 12 years on the Relativistic Rocket, with a peak speed of 0.997 c; meanwhile about 48 years would pass on Earth.
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Message 1651010 - Posted: 9 Mar 2015, 13:37:34 UTC - in response to Message 1650283.  
Last modified: 9 Mar 2015, 13:44:53 UTC

Astronomers believe mysterious signals - previously dismissed as stellar bursts - are coming from an Earth-like planet.


If so then: are they repeating in a cyclic manner? is the frequency on which received especially relevant to this premise?. Why don't they decode the message?

Why do they think this might be an intelligent message?


It seems to me to support the conjecture they would have to furnish reasons along the lines that I have suggested.

I know the Daily Mail has a huge circulation; but in reading the article, it looks to me to be worse than our "Supermarket Tabloids" in content. Perhaps the planet doesn't even exist. The picture is obviously a fake, and I say again what makes them think that the emissions are from an intelligent civilization.
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Message 1651232 - Posted: 10 Mar 2015, 2:21:04 UTC - in response to Message 1651010.  
Last modified: 10 Mar 2015, 2:37:08 UTC

Nobody’s claimed to have detected “signals“ in the sense of messages AFAICT; the term is being used with the data-processing or statistical meaning—as opposed to “noise”. What they’re talking about(*) is Doppler-shift observations of the primary’s motion, and specifically whether certain fluctuations represent the ‘fingerprint’ of an orbiting planet or some kind of pulsation or similar behaviour on the part of the star itself.

*) “They“ meaning the astronomers, not necessarily the popular press.

P.S. I believe this is the paper on which the above story was based; see also this rebuttal.
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