Reply to topic  [ 436 posts ]  Go to page Previous  1 ... 5, 6, 7, 8, 9, 10, 11 ... 18  Next
The Astronomy Thread 
Author Message
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
Suederwind wrote:
Astronomers Find a New Type of Planet: The "Mega-Earth" Link

It's a bit goofy that they insist on classifying every rocky exoplanet as some flavor of "Earth." Kepler-10c is as massive as Neptune and has a smaller orbit than Mercury; it's nothing at all like Earth.

_________________
Outsider


Mon Jun 02, 2014 3:09 pm
Profile WWW

Joined: Thu Jul 05, 2012 1:55 pm
Posts: 771
Post Re: The Astronomy Thread
Quote:
It's a bit goofy that they insist on classifying every rocky exoplanet as some flavor of "Earth."


Yes, Stracciatella would be much better.

Jokes aside: a planet as massive and as close to the sun as this one would come very close to anyones idea of "hell".

_________________
Forum RP: Cydonia Rising
[RP]Cydonia Rising [IC]


Mon Jun 02, 2014 4:07 pm
Profile
User avatar

Joined: Tue Nov 06, 2012 11:10 am
Posts: 60
Location: United Kingdom
Post Re: The Astronomy Thread
Good news!

The Churymov-Gerasimenko comet has entered Rosetta's sights, and more interestingly, it appears to be a contact binary!

Image


Fri Jul 18, 2014 8:30 am
Profile

Joined: Thu Jul 05, 2012 1:55 pm
Posts: 771
Post Re: The Astronomy Thread
Found an interesting article about caves on the moon: Link
I didn't even know such things exist up there. Anyway, Nasa thinks (Link) that they could provide shelter for future settlements.

_________________
Forum RP: Cydonia Rising
[RP]Cydonia Rising [IC]


Fri Jul 18, 2014 12:23 pm
Profile
User avatar

Joined: Tue Nov 06, 2012 11:10 am
Posts: 60
Location: United Kingdom
Post Re: The Astronomy Thread
Fantastic News!

As you know I've been following the progress of Rosetta, from my periodic posts of it's achievements on these forums.

It's been over 10 years in the waiting, but finally Rosetta has just recently entered into orbit around comet 67P (Churyumov-Gerasimenko), a first in space exploration history. Delivering stunning detail of the comet. The Philae lander carried by Rosetta will hopefully be able to land on the surface for November 11th.

Image

EDIT: Link fixed


Wed Aug 06, 2014 10:33 am
Profile

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
So, a variety of news outlets are reporting that plankton was found on the exterior of the ISS. The money shot:

Quote:
Mr Solovyev was uncertain "how these microscopic particles could have appeared on the surface of the space station", adding that the organisms were not typical for Baikanour in Kazakhstan, from where the space station lifted off.

"Plankton in these stages of development could be found on the surface of the oceans.

"This is not typical for Baikonur. It means that there are some uplifting air currents which reach the station and settle on its surface,"



Le wut? Ok, I'll buy exoatmospheric air currents, sure, but connecting them to plankton on the ISS? Rather than contamination by a visiting vessel (Shuttle comes to mind) or space walk? Can anyone source this better than these random news stories that are popping up?


Tue Aug 19, 2014 2:21 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1262
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

Honestly, it isn't surprising to me. Back in 2013, there was a big surprise for climate scientists when a group of scientists taking rarified air samples in the upper troposphere discovered a significant percentage of bacteria and fungus in their samples.

Since the ISS interacts with the atmosphere on a regular basis, it is hardly outside the realm of possibility.


Tue Aug 19, 2014 2:42 pm
Profile WWW
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
It still seems more likely that it was contamination from a supply vehicle.

_________________
Outsider


Tue Aug 19, 2014 2:52 pm
Profile WWW

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
See, that would have been my guess too. I'm wondering if someone translating from Russian to English, or from science to "press", made a mistake or embellished something along the way. I recall there are some European readers poking around, hoping someone has something closer to the source.



Quote:
Honestly, it isn't surprising to me. Back in 2013, there was a big surprise for climate scientists when a group of scientists taking rarified air samples in the upper troposphere discovered a significant percentage of bacteria and fungus in their samples.


Troposphere goes up to what, little less than 20km? We've known bacteria and such get up to the stratosphere since... I dunno to be honest. I remember watching Nova or something on PBS back in the '80s talking about high-altitude low-level life beyond the reach of Everest. Showed them capturing samples in big air filters hanging from balloons and what have you. They found new ones more recently in 2009, I remember that.

The ISS has a periapsis over 400km, well out of the troposphere, past the stratosphere, beyond the mesosphere, and into the thermosphere.


Tue Aug 19, 2014 6:00 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1262
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

Contamination by a supply vehicle is certainly a strong possibility, but I still wouldn't rule out atmospheric lift. Atmospheric lift has supported a 4188.7cm^3 object to an altitude with an average pressure of 1 mbar. I know things get more complicated mathematically as you go up, but at first glance, it seems at least possible that a 9.0e-19cm^3 particle could be lifted to an altitude with an average pressure of 1.4e-17 mbar.


Tue Aug 19, 2014 8:51 pm
Profile WWW

Joined: Thu Jul 05, 2012 1:55 pm
Posts: 771
Post Re: The Astronomy Thread
Hm... The only news I did read about this discovery, was in the german newspaper "Der Spiegel": http://m.spiegel.de/wissenschaft/weltall/a-986833.html
There is nothing more about it there, expect that they discovered those microorganisms last year.

_________________
Forum RP: Cydonia Rising
[RP]Cydonia Rising [IC]


Wed Aug 20, 2014 1:55 am
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
NASA spokesman Dan Huot: "As far as we're concerned, we haven't heard any official reports from our Roscosmos colleagues that they've found sea plankton. The Russians did take samples from one of the windows on the Russian segment, and what they're actually looking for is residues that can build up on the visually sensitive elements, like windows, as well as just the hull of the ship itself that will build up whenever they do thruster firings for things like re-boosts. That's what they were taking samples for. I don't know where all the sea plankton talk is coming from."

_________________
Outsider


Fri Aug 22, 2014 12:10 am
Profile WWW

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
I was once told that when dealing with the Russians, "Doveryai, no proveryai." Seems apt as always. Thanks, Arioch.


Sat Aug 23, 2014 7:26 am
Profile
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1262
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

This was news months ago, but I only just heard about it today.

Astronomers discover strong Thorne-Zytkow Object candidate

I didn't even know what a Thorne-Zytkow Object was until now, but it is what you get when a neutron star is enveloped by another star. In this case, it looks like a neutron star was dragged into a companion when it expanded to become a giant.


Sat Sep 27, 2014 5:48 pm
Profile WWW
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
Strange. You would think that a neutron star plunging into the core of a red supergiant would either cause the supergiant to explode or collapse... having a neutron star at your core seems like it should either shut down fusion or cause it to run amok.

_________________
Outsider


Sat Sep 27, 2014 8:24 pm
Profile WWW
User avatar

Joined: Fri Jan 24, 2014 5:22 pm
Posts: 353
Post Re: The Astronomy Thread
Eh... neutron stars are very dense, but as it said in the article, they're a lot less massive than red supergiants. I wouldn't be surprised if it caused some weirdness, but I wouldn't say it'd be most likely to do that.

They have a mass several times that of the Sun. A red supergiant will have more than ten solar masses.

_________________
If every cloud had a silver lining, there would be a lot more plane crashes.


Sun Sep 28, 2014 6:38 am
Profile
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
Yeah, but I'm sayin'... you're putting a huge mass of superdense non-compressible, non-fissionable material at the core of a star that's already running on fumes. The impact alone might cause a supernova-sized explosion, but if not, you've now got a giant neutron sitting at your core.

_________________
Outsider


Sun Sep 28, 2014 10:27 am
Profile WWW
User avatar

Joined: Sat Mar 05, 2011 1:35 pm
Posts: 1262
Location: Middle of Nowhere
Post Re: The Astronomy Thread
hi hi

Here's some more specific, in depth information on how the process works, in a format clearly made by a scientist and not a graphic designer. (Yellow text on a black background? ouch!)

Science is math!


Sun Sep 28, 2014 1:00 pm
Profile WWW
Site Admin
User avatar

Joined: Fri Mar 04, 2011 9:19 pm
Posts: 2951
Location: San Jose, CA
Post Re: The Astronomy Thread
ALMA radio telescope image of the protoplanetary disk around HL Tauri:

Image

The gaps in the disk are, presumably, planetesimals. And since the star is only about a million years old, they formed very quickly.

http://apod.nasa.gov/apod/astropix.html

_________________
Outsider


Mon Nov 10, 2014 2:46 am
Profile WWW
User avatar

Joined: Mon Mar 21, 2011 11:31 am
Posts: 749
Post Re: The Astronomy Thread
Arioch wrote:
ALMA radio telescope image of the protoplanetary disk around HL Tauri:



Is that an Outsider Insider hint? A Soia object? ;)

_________________
Image


Mon Nov 10, 2014 11:07 am
Profile
User avatar

Joined: Tue Nov 06, 2012 11:10 am
Posts: 60
Location: United Kingdom
Post Re: The Astronomy Thread
Only 10 minutes till "landing" of the 7 hour descent... fingers crossed!


Image


Wed Nov 12, 2014 8:51 am
Profile
User avatar

Joined: Sat Mar 05, 2011 9:03 am
Posts: 785
Location: Quebec, Canada
Post Re: The Astronomy Thread
i heard they had problem with the harpoon that was supposed to secure the probe on the comet. did they fix that?


Thu Nov 13, 2014 3:46 pm
Profile WWW

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
Apparently, no. Last I read the probe had bounced a few times on landing and wound up more than a kilometer out of position and possibly on its side in a crater. Its not getting enough sunlight to sustain operations where it is at, so its on borrowed time. In the position its in, they can't use the drill either.

http://www.bbc.com/news/science-environment-30034060
http://www.usatoday.com/story/news/worl ... /18956763/


Thu Nov 13, 2014 3:55 pm
Profile
User avatar

Joined: Sat Mar 05, 2011 9:03 am
Posts: 785
Location: Quebec, Canada
Post Re: The Astronomy Thread
cant they move it again?


Fri Nov 14, 2014 3:49 pm
Profile WWW

Joined: Mon Apr 25, 2011 6:04 pm
Posts: 263
Post Re: The Astronomy Thread
The only thruster I am aware of that on the descent vehicle was actually a thruster designed to drive it into the comet to help negate bounce. That thruster and the harpoon both failed, is what I've seen.


Fri Nov 14, 2014 8:30 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 436 posts ]  Go to page Previous  1 ... 5, 6, 7, 8, 9, 10, 11 ... 18  Next

Who is online

Users browsing this forum: Mjolnir and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.