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

Message boards : SETI@home Science : Planet Hunters Report Record-Breaking Discovery, Search for other habitable planets
Message board moderation

To post messages, you must log in.

Previous · 1 . . . 5 · 6 · 7 · 8 · 9 · 10 · 11 . . . 23 · Next

AuthorMessage
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1610674 - Posted: 8 Dec 2014, 6:33:54 UTC - in response to Message 1609477.  

so far noone has been calculating how far the signals from Earth would go to Space...as the emitters got more and more powerful from 1890 on...

Recently emitters have been getting less and less powerful as the spectrum has become more and more crowded.

Yes...and most of the DATA goes underground to cables... :/
We might think of ourselves as advanced...having short range BT & WiFi...but can some ET hear us?

How come nobody thought about comare signal from Earth against backround noise...and see how far can Earth be detected... ;)


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1610674 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1610675 - Posted: 8 Dec 2014, 6:37:33 UTC - in response to Message 1609519.  


...

and we are doing some 100y of radio transmission on Earth...so anyone around 50ly radius would respond by now (if he wanted)! ;)

So, I agree with you! Not so much inteligence around...or they are SHY!

It is likely the television and radio signals we have been sending out into space are too weak to distinguish from background noise at interstellar distances.

if that was the case, SETI@home would not exist...and it does!
also: http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.html

so far noone has been calculating how far the signals from Earth would go to Space...as the emitters got more and more powerful from 1890 on...


Here is a quote from a website about how far signals have gotten from us.

"Because of this inverse square law, all of our terrestrial radio signals become indistinguishable from background noise at around a few light-years from earth. For a civilization only a couple hundred light-years away, trying to listen to our broadcasts would be like trying to detect the small ripple from a pebble dropped in the pacific ocean off the coast of California – from Japan."

http://zidbits.com/2011/07/how-far-have-radio-signals-traveled-from-earth/

Nice...so back to SETI - how do we think we can detect some signal from outher space, houndreds or even millions of ly away? :/


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1610675 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1610814 - Posted: 8 Dec 2014, 14:24:39 UTC - in response to Message 1610675.  
Last modified: 8 Dec 2014, 14:27:47 UTC

how do we think we can detect some signal from outher space


Many of us believe, since we have been listening for 50 years now, that only a very high powered, intentionally focused beacon (laser or microwave) type of signal could be detected. Since THEY would not know that we are here, this would likely be a slewing type of transmission and would likely not be a constant signal burt rather a one-time event.

As far as I know, we are not transmitting such a message. Let's hope that: if another civilization exists, that they are not as ignorant as we are in this regard.
ID: 1610814 · Report as offensive
Profile Bob DeWoody
Avatar

Send message
Joined: 9 May 10
Posts: 3387
Credit: 4,182,900
RAC: 10
United States
Message 1610860 - Posted: 8 Dec 2014, 16:33:53 UTC

Assuming there are space faring civilizations in our portion of the Milky Way we will most likely be found purely by chance and the same goes the other way. We might be looking for a very long time or we may make contact tomorrow.
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.
ID: 1610860 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1611181 - Posted: 9 Dec 2014, 7:00:26 UTC - in response to Message 1610860.  

Assuming there are space faring civilizations in our portion of the Milky Way we will most likely be found purely by chance and the same goes the other way. We might be looking for a very long time or we may make contact tomorrow.

Or maybe comnbination of Arecibo with software could find even faint signal...so to rephrase question: how faint signal can we detect with this software? ;)

In other words...how FAR can we "hear someone fart"? :D


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1611181 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1611339 - Posted: 9 Dec 2014, 15:48:49 UTC - in response to Message 1611230.  
Last modified: 9 Dec 2014, 15:51:06 UTC

Assuming that there are OTHERS to find us out there in our Galaxy and beyond; we won't be found since we are not broadcasting any powerful, focused blasts out into the cosmos.

If They were close enough to pick up our radar or TV broadcasts, we would have heard them by now ourselves.

I don't think that any legitimate contact would, could or should be kept secret.
ID: 1611339 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1611590 - Posted: 10 Dec 2014, 7:05:42 UTC
Last modified: 10 Dec 2014, 7:06:22 UTC

Assuming that there are OTHERS to find us out there in our Galaxy and beyond; we won't be found since we are not broadcasting any powerful, focused blasts out into the cosmos.


Well, we are...talking to our probes near Jupiter, Saturn, Pluto & Mars...

The question is: if we beam our data to those probes...and those are powerfull beams enough to get to those probes...so they would reach probably further than several ly (5-10ly is what radio emissions are heared)...
So to what systems that lay beyond our probes did we send data? And which data?
Are there any SETI candicates (that we know of) beyond our probes?
How much would the signal reach if we talk to Voyager 1 or 2? Rosseta? MAVEN & the rovers on Mars?

List of missions:
http://science.nasa.gov/missions/
http://www.esa.int/ESA/Our_Missions , http://sci.esa.int/home/51459-missions/
...


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1611590 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1611767 - Posted: 10 Dec 2014, 15:18:45 UTC - in response to Message 1611590.  
Last modified: 10 Dec 2014, 15:19:09 UTC

The Voyager space craft is only 13 billion miles from earth and will take another 300 years to reach the Oort cloud which is the outer limit of our Solar system.

The nearest star system is about 4 light-years away or about 20 Trillion miles.

We could probably detect TV and Radar at these distances --but for the past 50 years we haven't heard a thing as far as we know. It could also be that we did hear them but never had the smarts to decode their transmission--this is not likely in my opinion.
ID: 1611767 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1612177 - Posted: 11 Dec 2014, 10:01:39 UTC - in response to Message 1611767.  

Again, maybe I didn't write it correctly...

As o many of us go from terrestrial signal TV to cable, most our transmission goes underground...so they (if they are also listening), might not hear us...

Only transmission that we make beyond Earth are the ones we do with our probes...so if "they" pick up anything, it will be that!
Of course they would have to be on the line of the Earth & probe itself... ;)


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1612177 · Report as offensive
Larry Monske

Send message
Joined: 17 Sep 05
Posts: 281
Credit: 554,328
RAC: 0
United States
Message 1612958 - Posted: 12 Dec 2014, 20:51:34 UTC - in response to Message 1384657.  

Lets see where prioities lay. Any of these "predicted" planets arent even confirmed let alone even having an atmosphere. They are too far away to study let alone see them. We spent how much on finding exo-planets BILLIONS how many planets can be reached in 1,350,000 years travel one way. Mankind could never get there at 64,000.
Now what is in place to stop/change orbit of an earth crossing asteroid , exactly nothing. Amuture astronomers find the bulk of them to all the very large scopes they are a nusence something to foil their images.
Realistically we are too far from other stars and man cant endure more than 300 days in zero G.Our technology is require anothera million years or more before any attempt could feasibly be made.
We will get smacked by an asteroid long before we find life on another world history shows every thousand years we get hit by something big thats assured not that it will happen but when. If you arent looking for them it increases our chances a 100 fold.
ID: 1612958 · Report as offensive
Profile Julie
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 28 Oct 09
Posts: 34041
Credit: 18,883,157
RAC: 18
Belgium
Message 1613027 - Posted: 12 Dec 2014, 22:51:20 UTC - in response to Message 1612958.  

Lets see where prioities lay. Any of these "predicted" planets arent even confirmed let alone even having an atmosphere. They are too far away to study let alone see them. We spent how much on finding exo-planets BILLIONS how many planets can be reached in 1,350,000 years travel one way. Mankind could never get there at 64,000.
Now what is in place to stop/change orbit of an earth crossing asteroid , exactly nothing. Amuture astronomers find the bulk of them to all the very large scopes they are a nusence something to foil their images.
Realistically we are too far from other stars and man cant endure more than 300 days in zero G.Our technology is require anothera million years or more before any attempt could feasibly be made.
We will get smacked by an asteroid long before we find life on another world history shows every thousand years we get hit by something big thats assured not that it will happen but when. If you arent looking for them it increases our chances a 100 fold.



Very clear post, thank you Larry.
rOZZ
Music
Pictures
ID: 1613027 · Report as offensive
Profile Wiggo
Avatar

Send message
Joined: 24 Jan 00
Posts: 34744
Credit: 261,360,520
RAC: 489
Australia
Message 1613518 - Posted: 13 Dec 2014, 20:30:54 UTC

In a 1st, a "super-Earth" has been found by a ground-based telescope.

http://www.news.com.au/technology/science/super-earth-alien-planet-spotted/story-fnjwlcze-1227155326111

But it's unlikely that it's habitable.

Cheers.
ID: 1613518 · Report as offensive
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 14162
Credit: 79,603,650
RAC: 123
United States
Message 1614305 - Posted: 15 Dec 2014, 19:31:13 UTC - in response to Message 1613518.  

Astronomers find Pluto-sized objects using ALMA

Harvard astronomers have found Pluto-sized objects moving around the sun. According to the published paper, these objects can be closely related with stars too. The discovery was made by using the Atacama Large Millimeter/submillimeter Array (ALMA), a radio telescope setup in Chile.

Interesting.

http://uncovercalifornia.com/content/22663-astronomers-find-pluto-sized-objects-using-alma
ID: 1614305 · Report as offensive
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 14162
Credit: 79,603,650
RAC: 123
United States
Message 1616018 - Posted: 18 Dec 2014, 23:56:41 UTC - in response to Message 1614305.  

Kepler Spacecraft Finds New Planet

A year and a half after a pointing failure threatened to derail its epochal search for worlds beyond our solar system, NASA’s Kepler spacecraft has bagged another planet, astronomers announced Thursday. The new planet is 20,000 miles in diameter, about two and a half times the size of Earth, and 12 times as massive, putting it into a category of planets called super-Earths that do not exist in our solar system. It is unlivable, circling a star slightly smaller than the Sun about 180 light-years from here in the constellation Pisces at the roasting distance of only 8.4 million miles, less than a tenth of the distance between us and our star.

http://www.nytimes.com/2014/12/19/science/kepler-spacecraft-finds-new-planet.html?_r=0
ID: 1616018 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1616099 - Posted: 19 Dec 2014, 6:53:02 UTC - in response to Message 1616018.  

Kepler Spacecraft Finds New Planet

A year and a half after a pointing failure threatened to derail its epochal search for worlds beyond our solar system, NASA’s Kepler spacecraft has bagged another planet, astronomers announced Thursday. The new planet is 20,000 miles in diameter, about two and a half times the size of Earth, and 12 times as massive, putting it into a category of planets called super-Earths that do not exist in our solar system. It is unlivable, circling a star slightly smaller than the Sun about 180 light-years from here in the constellation Pisces at the roasting distance of only 8.4 million miles, less than a tenth of the distance between us and our star.

http://www.nytimes.com/2014/12/19/science/kepler-spacecraft-finds-new-planet.html?_r=0

It's ALIVE...Jim, it's ALIVE! ;)

Kepler lives... :D


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1616099 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1616257 - Posted: 19 Dec 2014, 12:54:59 UTC - in response to Message 1616099.  
Last modified: 19 Dec 2014, 12:56:10 UTC

If we can find a planet of this size at 180 light years ---does that mean that there are no Earth sized planets within, say, 50-100 light years??

It may be that this planet is somewhat large and close to it's sun and therefore may be discernible as it transits across it's star on a frequent basis. So if there are Earth-sized planets within this distance they may be further out from their star and/or not in our line of sight.
ID: 1616257 · Report as offensive
Profile Bob DeWoody
Avatar

Send message
Joined: 9 May 10
Posts: 3387
Credit: 4,182,900
RAC: 10
United States
Message 1616262 - Posted: 19 Dec 2014, 13:19:52 UTC

As I understand the method, only planets that transit across the face of a star can be detected. Meaning their orbital plane must be near to edge on relative to earth. Unless there is some bias toward this orientation we may be missing thousands of planetary systems whose orbital plane is canted at angles greater than a few degrees up to 90 degrees
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.
ID: 1616262 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1616281 - Posted: 19 Dec 2014, 14:37:35 UTC - in response to Message 1616262.  
Last modified: 19 Dec 2014, 15:04:15 UTC

it seems to me that a sphere would always appear as a disc and that crossing it at any angle would be discernible. They also use the wobble effect of a planet on it's star to imply a planet's existence.

Retracted: I see now that we and the planet must be on the same line of sight with the star.
ID: 1616281 · Report as offensive
Profile Bob DeWoody
Avatar

Send message
Joined: 9 May 10
Posts: 3387
Credit: 4,182,900
RAC: 10
United States
Message 1616285 - Posted: 19 Dec 2014, 14:54:15 UTC - in response to Message 1616281.  

it seems to me that a sphere would always appear as a disc and that crossing it at any angle would be discernible. They also use the wobble effect of a planet on it's star to imply a planet's existence.

An object orbiting a sphere when viewed from somewhere outside the system will only cross in front of the sphere when the orbital plane is nearly edge on to the observer. When viewed from the perpendicular the object will remain nearly the same distance from the center depending on how circular the orbit is.

The wobble method can determine whether a star has companions but not much else.
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.
ID: 1616285 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1617315 - Posted: 22 Dec 2014, 10:24:01 UTC

Actually wobble of the star only indicated that it has Jovian type of planet! ;)


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1617315 · Report as offensive
Previous · 1 . . . 5 · 6 · 7 · 8 · 9 · 10 · 11 . . . 23 · Next

Message boards : SETI@home Science : Planet Hunters Report Record-Breaking Discovery, Search for other habitable planets


 
©2024 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.