Space news topic and space related news

Started by Tsanten Eywa 'eveng, September 23, 2011, 03:31:21 PM

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`Eylan Ayfalulukanä

I wonder then, how much oxygen and other gases the earth's atmosphere has lost over time, and what the implications are for long-term life on earth?

Yawey ngahu!
pamrel si ro [email protected]

Toliman

Quote from: `Eylan Ayfalulukanä on January 31, 2017, 03:31:20 PM
I wonder then, how much oxygen and other gases the earth's atmosphere has lost over time, and what the implications are for long-term life on earth?
I wonder about it too.
Generally, stellar wind can have big affect on planetary atmosphere but strongly depends on distance of planet and luminosity of mother star, of course.

Toliman

Water detected in the atmosphere of hot Jupiter exoplanet 51 Pegasi b

Astronomers have detected the presence of water molecules in the atmosphere of a nearby hot Jupiter exoplanet known as 51 Pegasi b (51 Peb b for short). The discovery sheds new light on the nature of the exoworld's atmosphere and indicates that the star-planet system is a double-lined spectroscopic binary. ...

https://phys.org/news/2017-02-atmosphere-hot-jupiter-exoplanet-pegasi.html

Vawmataw

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`Eylan Ayfalulukanä


Yawey ngahu!
pamrel si ro [email protected]

Tìtstewan

I've heared about it. So cool!
In an optimal case, there could be 3 habitable planets.

There is a cool animation:
https://exoplanets.nasa.gov/newworldsatlas/1969/

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archaic

Quote from: `Eylan Ayfalulukanä on January 26, 2017, 04:17:41 PM
The so-called 'island of stability has yet to manifest itself, at least not as a stable nucleon. There were some folks who felt they would find one at a lower atomic number, but it never materialized. Element 126, assuming there is not a new shell, would be under Plutonium in the actinide or inner transition metal series.
The possible 'G' orbital?
Pasha, an Avatar story, my most recent fanfic, Avatar related, now complete.

The Dragon Affair my last fanfic, non Avatar related.

Toliman

Quote from: archaic on February 25, 2017, 02:30:44 PM
Quote from: `Eylan Ayfalulukanä on January 26, 2017, 04:17:41 PM
The so-called 'island of stability has yet to manifest itself, at least not as a stable nucleon. There were some folks who felt they would find one at a lower atomic number, but it never materialized. Element 126, assuming there is not a new shell, would be under Plutonium in the actinide or inner transition metal series.
The possible 'G' orbital?
Looks that yes.

`Eylan Ayfalulukanä

Quote from: archaic on February 25, 2017, 02:30:44 PM
Quote from: `Eylan Ayfalulukanä on January 26, 2017, 04:17:41 PM
The so-called 'island of stability has yet to manifest itself, at least not as a stable nucleon. There were some folks who felt they would find one at a lower atomic number, but it never materialized. Element 126, assuming there is not a new shell, would be under Plutonium in the actinide or inner transition metal series.
The possible 'G' orbital?

Yes.

Yawey ngahu!
pamrel si ro [email protected]

Toliman

Maybe second the closest habitable exoplanet:

Habitable Planet Reality Check: The Nearby GJ 273 or Luyten's Star

In recent years, the media has been filled with news about the thousands of extrasolar planets found by NASA's Kepler spacecraft as it monitors the brightness of hundreds of thousands of stars looking for transits. Because of the wide net cast by Kepler in its primary and now its "K2" extended mission, most of those exoplanets discoveries are many hundreds of light years away or more. Inevitably the lay public asks "why aren't astronomers looking for exoplanets around stars closer to us... maybe someplace we might have a chance of reaching someday?". ...

http://www.drewexmachina.com/2017/03/20/habitable-planet-reality-check-the-nearby-gj-273-or-luytens-star/

Toliman

Newly Discovered Exoplanet May be Best Candidate in Search for Signs of Life

An exoplanet orbiting a red dwarf star 40 light-years from Earth may be the new holder of the title "best place to look for signs of life beyond the Solar System". Using ESO's HARPS instrument at La Silla, and other telescopes around the world, an international team of astronomers discovered a "super-Earth" orbiting in the habitable zone around the faint star LHS 1140. This world is a little larger and much more massive than the Earth and has likely retained most of its atmosphere. This, along with the fact that it passes in front of its parent star as it orbits, makes it one of the most exciting future targets for atmospheric studies. The results will appear in the 20 April 2017 issue of the journal Nature.

The newly discovered super-Earth LHS 1140b orbits in the habitable zone around a faint red dwarf star, named LHS 1140, in the constellation of Cetus (The Sea Monster). Red dwarfs are much smaller and cooler than the Sun and, although LHS 1140b is ten times closer to its star than the Earth is to the Sun, it only receives about half as much sunlight from its star as the Earth and lies in the middle of the habitable zone. The orbit is seen almost edge-on from Earth and as the exoplanet passes in front of the star once per orbit it blocks a little of its light every 25 days. ...

More here:
http://www.eso.org/public/unitedkingdom/news/eso1712/?lang

Vawmataw

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Toliman

It looks as reasonable explanation, I think.

Vawmataw

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Toliman

NASA Releases Kepler Survey Catalog with Hundreds of New Planet Candidates

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, which is the range of distance from a star where liquid water could pool on the surface of a rocky planet. ...

https://www.nasa.gov/press-release/nasa-releases-kepler-survey-catalog-with-hundreds-of-new-planet-candidates


Toliman

Proxima Centauri: What do we know?

Following the announcement of the discovery of Proxima b, the Red Dots campaign aims at detecting additional small planetary sized companions to Proxima Centauri. But we already have hints of variability in the star's radial velocities not explained by the presence of Proxima b alone. There is more to the star than Proxima b. ...

https://reddots.space/proxima-centauri-what-do-we-know-by-mikko-tuomi/



Vawmataw

QuoteThere is more to the star than Proxima b. ...
Exomoons? :P
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Toliman

Astronomers discover exoplanet where a year lasts four-and-a-half hours ;D

The Earth-sized exoplanet is in a high-speed orbit around its star.
Known as EPIC 228813918 b, the exoplanet orbits the m-dwarf star in less than four and a half hours, making one day the equivalent of more than five years.

more here:
http://www.foxnews.com/science/2017/07/18/astronomers-discover-exoplanet-where-year-lasts-four-and-half-hours.html

Toliman

Quite interesting ...

Hidden Stars May Make Planets Appear Smaller

In the search for planets similar to our own, an important point of comparison is the planet's density. A low density tells scientists a planet is more likely to be gaseous like Jupiter, and a high density is associated with rocky planets like Earth. But a new study suggests some are less dense than previously thought because of a second, hidden star in their systems.

https://www.nasa.gov/feature/jpl/hidden-stars-may-make-planets-appear-smaller

Toliman

Looks interesting too ...

New Hot Jupiter marks the first collaborative exoplanet discovery

Researchers led by a team at Keele University have discovered a new 'Hot Jupiter' exoplanet. The new giant planet was jointly discovered by a WASP/KELT survey collaboration, marking the first time an exoplanet has been discovered between two planet search groups.
The exoplanet, WASP-167b/KELT-13b, is several times more massive than Jupiter and orbits its parent star every two days. Its host star, WASP-176/KELT-13, is one of the hottest and most rapidly rotating stars known to host such a planet.

https://www.keele.ac.uk/pressreleases/2017/newhotjupitermarksthefirstcollaborativeexoplanetdiscovery.php