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 . . . 15 · 16 · 17 · 18 · 19 · 20 · 21 · Next

AuthorMessage
Profile Bob DeWoody
Avatar

Send message
Joined: 9 May 10
Posts: 2976
Credit: 1,496,539
RAC: 1,537
United States
Message 1864553 - Posted: 29 Apr 2017, 15:17:01 UTC

Wasn't earth frozen for a period of time?
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: 1864553 · Report as offensive     Reply Quote
Profile Chris S Crowdfunding Project Donor*Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40481
Credit: 41,363,079
RAC: 34
United Kingdom
Message 1864734 - Posted: 30 Apr 2017, 9:42:13 UTC - in response to Message 1864553.  

There have been at least five major ice ages in the earth's past (the Huronian, Cryogenian, Andean-Saharan, Karoo Ice Age and the Quaternary glaciation). Outside these ages, the Earth seems to have been ice-free even in high latitudes.
We have also had mini ice ages.

Ice ages
ID: 1864734 · Report as offensive     Reply Quote
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3378
Credit: 1,377,675
RAC: 1,196
United States
Message 1864738 - Posted: 30 Apr 2017, 10:38:02 UTC - in response to Message 1864734.  

In the last ice age the glaciers covered the state of Illinois down to Carbondale (almost 360 miles). You can see the terminal moraines when back packing in the Shawnee National Forest. The ice was said to be 2 miles thick or more.
ID: 1864738 · Report as offensive     Reply Quote
Profile Chris S Crowdfunding Project Donor*Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40481
Credit: 41,363,079
RAC: 34
United Kingdom
Message 1864980 - Posted: 1 May 2017, 7:06:19 UTC - in response to Message 1864738.  

The last ice age at 20,000 BC had Ice as far south as Birmingham in the UK. Now that the ice and the weight of it has gone, the land mass is still "springing back". In fact the UK is tilting along a pivot line from the River Severn estuary to the Wash, so much so that NW Scotland is rising out the sea, and Kent is slowly sinking under it. But don't worry it is only 1mm a year in Scotland and 0.5mm per year in Kent!

Tilt!
ID: 1864980 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1866358 - Posted: 9 May 2017, 5:42:21 UTC - in response to Message 1864980.  

This planetary system is located some 20,500 light years away from the Earth.


Two new Saturn-mass exoplanets discovered


(Phys.org)—An international team of astronomers has detected two new giant alien worlds circling distant stars. The newly found planets are estimated to be as massive as Saturn and are orbiting M dwarfs beyond the snow line. The findings were presented May 2 in a paper published online on the arXiv pre-print server.

The planets were discovered by researchers working as part of the Optical Gravitational Lensing Experiment (OGLE) group and the Microlensing Observations in Astrophysics (MOA) collaboration. OGLE uses the 1.3-m Warsaw Telescope located at Las Campanas Observatory in Chile, while MOA utilizes the 1.8-m MOA-II telescope at the Mount John University Observatory, located in New Zealand. The main goal of these two microlensing surveys is to study the planet formation around late-type stars.
ET Phone Home
ID: 1866358 · Report as offensive     Reply Quote
Profile Chris S Crowdfunding Project Donor*Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40481
Credit: 41,363,079
RAC: 34
United Kingdom
Message 1867686 - Posted: 17 May 2017, 11:22:36 UTC

ID: 1867686 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1869457 - Posted: 26 May 2017, 1:25:58 UTC - in response to Message 1867686.  

Puffy?



Giant ‘Styrofoam’ Planet Could Help Scientists Find New Habitable Worlds


We’re all pretty familiar with objects made from styrofoam. Our daily lives intersect with disposable items like coffee cups, insulation, hot and cold coolers and those seemingly millions of little cushioning styrofoam-y “things” that are put into mailing boxes to protect the more valuable contents.
ET Phone Home
ID: 1869457 · Report as offensive     Reply Quote
Profile Ghan-buri-Ghan Mike Project Donor

Send message
Joined: 27 Dec 15
Posts: 83
Credit: 31,488,869
RAC: 74,629
United States
Message 1871168 - Posted: 4 Jun 2017, 23:02:14 UTC

I had the opportunity last fall to audit the Univ of Virginia’s graduate radio astronomy course, taught by two members of the NRAO staff. Besides giving me much insight into the observational hurdles for SETI using ground based RTs (the observation window challenges), we were required to do the habitable zone calculation for Sol as a black-body radiation transfer problem. Interestingly, that habitable zone does not include Earth, much less Mars, because the HZ calculation does not factor in the greenhouse effects of planetary atmospheres. Earth lies just beyond the theoretical HZ limit for SOL. We know that Mars once had flowing water on its surface, but it is significantly outside Sol’s thermodynamically defined HZ. Exoplanet discoveries trumpeting “in the habitable zone” of stars need to be greeted with some skepticism. It will likely be the outliers of the zone that we need to be interested in. Sol’s only planet squarely in the HZ is Venus and it has a runaway greenhouse effect.
ID: 1871168 · Report as offensive     Reply Quote
Profile tullio Project Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6752
Credit: 1,984,571
RAC: 476
Italy
Message 1874028 - Posted: 19 Jun 2017, 16:56:50 UTC
Last modified: 19 Jun 2017, 16:57:11 UTC

Kepler has found 4034 planets. Ten of them are in the Goldilocks zone, one of them, KOI 7711 is a rocky one 30% wider than the Earth and has a orbital period of nearly one year. All this from a NASA conference at Ames Research Center today.
Tullio
ID: 1874028 · Report as offensive     Reply Quote
Profile Mr. Kevvy Crowdfunding Project Donor*Special Project $250 donor
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 15 May 99
Posts: 2046
Credit: 478,285,187
RAC: 373,490
Canada
Message 1874031 - Posted: 19 Jun 2017, 17:14:08 UTC - in response to Message 1874028.  
Last modified: 19 Jun 2017, 17:15:23 UTC

Kepler has found 4034 planets. Ten of them are in the Goldilocks zone...


The ten "Goldilocks zone" planets are new as of this batch of 219 announced today, not the only ones in the total 4,034.
(I think this is what you meant but it is worded such that it seems otherwise.)

Source

NASA’s Kepler space telescope team has released a mission catalog of planet candidates that introduces 219 new planet candidates, 10 of which are near-Earth size and orbiting in their star's habitable zone

“Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has.”
--- Margaret Mead

ID: 1874031 · Report as offensive     Reply Quote
Profile tullio Project Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6752
Credit: 1,984,571
RAC: 476
Italy
Message 1874032 - Posted: 19 Jun 2017, 17:18:57 UTC

I had heard of 50 Goldilocks in the total 4034. I think you are right.
Tullio
ID: 1874032 · Report as offensive     Reply Quote
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3378
Credit: 1,377,675
RAC: 1,196
United States
Message 1874040 - Posted: 19 Jun 2017, 18:47:27 UTC - in response to Message 1874032.  

we will need to refine further but it looks like the percentage of planets having the parameter "Temperature" in the range allowing life to develop is around 12.5 %. Now lets find the percentage of those that have water, magnetic field, ozone, Oxygen, etc so that a more realistic projection of how many truly "Earth Like" planets we might expect to be in our Galaxy.
ID: 1874040 · Report as offensive     Reply Quote
Profile tullio Project Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6752
Credit: 1,984,571
RAC: 476
Italy
Message 1874140 - Posted: 20 Jun 2017, 7:17:45 UTC

After Kepler, the NASA conference mentioned space missions TESS, the James Webb Space Telescope and WFIRST, which is in doubt for financial reasons. Mars can wait.
Tullio
ID: 1874140 · Report as offensive     Reply Quote
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3378
Credit: 1,377,675
RAC: 1,196
United States
Message 1874148 - Posted: 20 Jun 2017, 8:53:23 UTC - in response to Message 1874040.  
Last modified: 20 Jun 2017, 8:58:59 UTC

Correction: the percentage of planets found in the correct temperate zone so far is 1.25% not 12.5 %. I expect it is this low since it is difficult to "see" smaller planets. If all of the parameters have this low a possibility and there are a dozen essential ones ; then there may be as few truly Earth-like planets as 1 in 6,870,000,000,000,000,000,000. If there only six such parameters then there might be 1 in a billion or so. These estimates, though wildly uncertain, would be a far cry from the 40 billion such planets in our galaxy as stated by someone just recently. You would think that temperate zone would be fairly common in comparison to ,say, stabilizing moon, magnetic field, nearly circular orbit, water, existence of oxygen, ozone layer and so on.
.
Time will tell as we can see better into the cosmos. I am more sanguine towards believing that there may be a half dozen in the Galaxy. It would help if we had a list of essential parameters and conditions for intelligent life to form so that we could refine all of our uncertain, wild estimates over time.
ID: 1874148 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1874460 - Posted: 22 Jun 2017, 17:01:55 UTC - in response to Message 1874148.  


Updated Kepler catalog contains 219 new exoplanet candidates


Scientists have published a catalog of exoplanet discoveries made by NASA’s Kepler space telescope, identifying 219 previously-unknown planet candidates circling stars elsewhere in the galaxy, including 10 would-be worlds that appear to be about the same size of Earth with temperatures potentially hospitable for life.

Culling data collected during the first four years of Kepler’s mission, researchers used computers to pick out and analyze signals from stars that could be have caused by nearby planets. Automated software identified the detections most likely to be real worlds, according to Susan Thompson, a Kepler research scientist at the SETI Institute and NASA’s Ames Research Center who led the cataloging effort.

“This is the last search that we performed, and we used our most improved techniques, and with that we found 4,034 candidates, which include 10 new terrestrial-sized candidates in the habitable zone of their star,” Thompson said.
ET Phone Home
ID: 1874460 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1878906 - Posted: 18 Jul 2017, 5:56:47 UTC - in response to Message 1874460.  


NASA-funded Citizen Science Project Discovers New Brown Dwarf


One night three months ago, Rosa Castro finished her dinner, opened her laptop, and uncovered a novel object that was neither planet nor star. Therapist by day and amateur astronomer by night, Castro joined the NASA-funded Backyard Worlds: Planet 9 citizen science project when it began in February — not knowing she would become one of four volunteers to help identify the project's first brown dwarf, formally known as WISEA J110125.95+540052.8.
ET Phone Home
ID: 1878906 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1882867 - Posted: 9 Aug 2017, 20:33:32 UTC - in response to Message 1878906.  

light-years away!


Scientists find four Earth-like exoplanets orbiting closest sun-like star



Aug. 9 (UPI) -- Scientists have found four Earth-like exoplanets orbiting a star system just 12 light-years away.

The four planets are the closest Earth-like worlds yet discovered. And at just 1.7 Earth masses, they're also the smallest nearby Earth-like planets.

Astronomers detected the presence of the four exoplanets by analyzing slight wobbles in the movement of tau Ceti, the closest known sun-like star. Tau Ceti's wobbles are incredibly subtle, and required instruments capable of measuring deviations as small as 30 centimeters per second.
ET Phone Home
ID: 1882867 · Report as offensive     Reply Quote
Profile Bob DeWoody
Avatar

Send message
Joined: 9 May 10
Posts: 2976
Credit: 1,496,539
RAC: 1,537
United States
Message 1882968 - Posted: 10 Aug 2017, 12:59:24 UTC

So many planets and no way to get there.
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: 1882968 · Report as offensive     Reply Quote
rob smith Special Project $250 donor
Volunteer tester

Send message
Joined: 7 Mar 03
Posts: 16241
Credit: 320,293,670
RAC: 238,413
United Kingdom
Message 1882972 - Posted: 10 Aug 2017, 13:17:46 UTC

Time for a "Generation Ship"?
Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?
ID: 1882972 · Report as offensive     Reply Quote
Profile Lynn Special Project $75 donor
Volunteer tester
Avatar

Send message
Joined: 20 Nov 00
Posts: 12430
Credit: 39,853,938
RAC: 33,212
United States
Message 1887139 - Posted: 31 Aug 2017, 19:47:40 UTC - in response to Message 1882972.  

The study of extra-solar planets has turned up some rather interesting candidates in the past few years. As of August 1st, 2017, a total of 3,639 exoplanets have been discovered in 2,729 planetary systems and 612 multiple planetary systems. Many of these discoveries have challenged conventional thinking about planets, especially where their sizes and distances from their suns are concerned.

https://www.universetoday.com/137001/exoplanet-hunters-detect-two-new-warm-jupiters/
ET Phone Home
ID: 1887139 · Report as offensive     Reply Quote
Previous · 1 . . . 15 · 16 · 17 · 18 · 19 · 20 · 21 · Next

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


 
©2018 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.