Space/Science

A place for discussion of any science topic. From experts in the field to those who simply want to learn, all are welcome here. Speculation is welcome here; pseudoscience is not. A place for lively discussion of whatever science topics interest you.

Sub-boards: Transient Alerts

Gliese 581 and volatiles - dtb - 4/29/2007 10:07:20 PM

Amazingly sharp images of ISS from the ground with a Dobson and Telrad - Raoul - 4/29/2007 8:34:26 PM

A first since 2000 for Zvezda! - Raoul - 4/28/2007 7:51:46 PM
- Just saw very nice ISS pass - Peter Bruener - 4/29/2007 3:17:45 AM
  - oops, make that a z instead of an s (n/t) - Peter Bruener - 4/29/2007 3:20:10 AM

Wallpapers - Remy - 4/28/2007 2:55:08 PM
- Dramatic. Thanks. (n/t) - Bowser - 4/28/2007 9:25:41 PM
- re: Merci, Remy! (n/t) - Raoul - 4/28/2007 7:54:35 PM

NASA's Centennial Challenge for Improved Astronaut Gloves Set - Chris Vancil - 4/27/2007 10:45:46 PM
- re: More - Chris Vancil - 4/28/2007 8:44:45 AM
  - AS 17 gloves - Raoul - 4/28/2007 8:14:26 PM

Hawking 0 G today - Raoul - 4/26/2007 7:14:10 AM
- re: Hawking 0 G today - Marcia - 4/27/2007 8:41:36 PM
- re: He did it!!!!!! - Raoul - 4/27/2007 7:34:45 AM
  - re: re:A dream come true - Johannes - 4/27/2007 6:52:05 PM
    - re: re:A dream come true - Raoul - 4/27/2007 8:52:29 PM
      - re: re:I know what you mean. - Johannes - 4/28/2007 7:44:27 PM

Houston High Schoolers Create Astronaut Training Hardware - Chris Vancil - 4/28/2007 8:52:27 AM

Jack's UFO post moved to Off Topic, sorry (n/t) - Raoul moderating - 4/27/2007 12:23:47 PM
- Don't apologize for doing the correct thing (n/t) - Buck Galaxy - 4/28/2007 2:50:34 AM

Black holes and supermassive black holes. - Marcia - 4/27/2007 7:42:08 PM

Sunita Williams to return with an earlier flight - Raoul - 4/27/2007 12:38:48 PM
- re: Sunita Williams to return with an earlier flight - agreed, Raoul! - Marcia - 4/27/2007 2:10:55 PM
  - STS 117 and STS 118 are going to have to change their badges! - Raoul - 4/27/2007 4:01:12 PM

Amateur astronomers considered a threat in NATO paper - Raoul - 4/24/2007 8:20:27 PM
- re: We talked about this years ago - SteveS - 4/25/2007 12:34:12 PM
  - Yes, indeed - Raoul - 4/25/2007 12:52:06 PM
    - re: Speaking of; ISS pass for S.F. area people - SteveS - 4/26/2007 2:26:26 AM
- A fascinating document! - McFly - 4/25/2007 4:28:00 AM
- NATO is US dominated. The US regards even it's own civilians as a threat. (n/t) - Bowser - 4/25/2007 2:41:31 AM
- Amateur astronomers have radar?!? (n/t) - SDF - 4/24/2007 9:27:47 PM
  - No idea....wondering if NATO knows more about it (n/t) - Raoul - 4/24/2007 9:37:22 PM
    - Satellite orbital elements used to be public knowledge - SDF - 4/24/2007 9:48:28 PM
      - re: Amateurs indeed want to predict visiblity of a satellite - Raoul - 4/24/2007 9:56:39 PM
        
        Norad is still publishing 2-line element sets for various satellites - SDF - 4/25/2007 3:42:42 PM
        
        The big boys can track them too - m-5 - 4/27/2007 3:36:40 PM

Earth-like planet, with water, around red dwarf Gliese 581? - REB - 4/24/2007 7:31:46 PM
- Are we *sure* it'd have volatiles? - dtb - 4/26/2007 1:13:42 PM
  - No such thing as sure - nick hoffman - 4/26/2007 11:37:36 PM
- It's actually has a diameter 50% larger than our world. - Jacob Samorodin - 4/25/2007 11:16:43 PM
  - re: Would the absense of a magnetic field be as catastrophic to the atmosphere of a red-dwarf planetary system? - The Artist formerly known as Scott Evil - 4/26/2007 3:15:47 AM
    - Solar wind - nick hoffman - 4/26/2007 9:53:47 AM
      - re: Solar wind - Joe P. - 4/26/2007 4:49:47 PM
        
        "day" and "year" - nick hoffman - 4/26/2007 11:47:47 PM
      - very interesting... Now we need a imaging telescope that can tell us more! - The Artist formerly known as Scott Evil - 4/26/2007 1:40:37 PM
- re: The discoverer - Raoul - 4/25/2007 6:24:36 AM
- Two interesting facts... - TB - 4/25/2007 6:12:00 AM
- Couple of questions: - TB - 4/25/2007 5:46:25 AM
  - re: Couple of questions: - REB - 4/25/2007 1:37:28 PM
    - Splitting Hairs - 3 days per 2 years - M.A.E. - 4/25/2007 9:06:37 PM
      - Who needs an atmosphere? - nick hoffman - 4/25/2007 11:10:46 PM
        
        Good point but - M.A.E. - 4/26/2007 2:31:25 AM
        
        re: Good point but - Excellent points by both of you (MAE & Nick). - Marcia - 4/26/2007 8:44:42 PM
    - re: Couple of questions: - Raoul - 4/25/2007 2:15:50 PM
      - Did some digging. maybe this will help. - REB - 4/25/2007 2:30:44 PM
        
        re: Did some digging. maybe this will help. Thanks, REB. - Marcia - 4/26/2007 2:03:16 PM
        
        Speaking of a moon- could part of this planet's calculated mass be a moon? - REB - 4/26/2007 2:34:40 PM
        
        Not 4 Earth masses- 5 Earth masses. - REB - 4/26/2007 2:57:26 PM
        
        I would love to see a true binary-planet... Where two relatively equal planets are sharing the same center of gravity. - The Artist formerly known as Scott Evil - 4/26/2007 4:25:03 PM
        
        I wonder what it would have been like to have Venus as our moon. - REB - 4/26/2007 9:57:49 PM
        
        Very Good point! - The Artist formerly known as Scott Evil - 4/26/2007 2:50:57 PM
        
        Good detective work. You were correct! - ER - 4/25/2007 3:13:11 PM
      - re: Couple of questions: - REB - 4/25/2007 2:22:58 PM
  - re: Couple of questions: - ER - 4/25/2007 11:19:37 AM
    - re: The flares could themselves result in "seasons" on such a planet. - The Artist formerly known as Scott Evil - 4/25/2007 2:44:07 PM
      - Interesting... - nick hoffman - 4/25/2007 11:07:18 PM
        
        I've always thought of seasonality as being critical to drive evolution. - The Artist formerly known as Scott Evil - 4/26/2007 3:26:56 AM
        
        re: I've always thought of seasonality as being critical to drive evolution. - Joe P. - 4/26/2007 4:55:37 PM
        
        Interesting idea, I've started a new thread on it, I hope you don't mind. (n/t) - ER - 4/26/2007 2:36:15 PM
        
        Not at all. - The Artist formerly known as Scott Evil - 4/26/2007 2:53:31 PM
        
        Well Evolution Requires Either Genetic Drift Or Selective Pressure - M.A.E. - 4/26/2007 2:07:13 PM
        
        Getting wiped out can be good for evolution. - The Artist formerly known as Scott Evil - 4/26/2007 4:40:25 PM
      - Donâ€™t Red Dwarfs flair when they are young and calm down as they get older? - REB - 4/25/2007 2:48:57 PM
        
        Flares last minutes, maybe an hour or so (n/t) - phil - 4/25/2007 2:52:33 PM
        
        I mean a Red Dwarfâ€™s Flare frequency goes decreases as the star ages. - REB - 4/25/2007 2:55:23 PM
        
        rI'm specificly referring to red dwarf flare times (n/t) - phil - 4/25/2007 2:59:20 PM
  - Found a few answers - TB - 4/25/2007 6:13:19 AM
    - Also, what about moons, double planets - Sawyer - 4/25/2007 1:10:56 PM
      - Massive solar tides - ER - 4/25/2007 1:37:21 PM
        
        Tides - phil - 4/25/2007 2:58:39 PM
        
        Not sure about that... - TB - 4/25/2007 2:34:07 PM
        
        I think it would depend on the specific make-up of the planet and it's atmosphere (if any) - The Artist formerly known as Scott Evil - 4/25/2007 2:46:52 PM
        
        You're right about the tides, senior moment on my part. - ER - 4/25/2007 2:44:57 PM
        
        Don't be too hard on yourself - TB - 4/25/2007 4:25:37 PM
        
        re: You're right about the tides, senior moment on my part. - REB - 4/25/2007 2:57:21 PM
        
        re: Massive solar tides - REB - 4/25/2007 1:51:15 PM
        
        re: Massive solar tides - ER - 4/25/2007 3:09:29 PM
        
        Mercury - nick hoffman - 4/25/2007 10:50:38 PM
- Well, that's not fair... - TB - 4/25/2007 5:44:30 AM
- Data on this Star (from 2nd Gleise Catalog) - ER - 4/25/2007 12:03:02 AM
- Wow! - Peter Bruener - 4/24/2007 9:28:05 PM
  - re: Wow! - Raoul - 4/24/2007 9:41:52 PM
  - I got the size wrong. This planet is 50% larger than the Earth. - REB - 4/24/2007 9:38:30 PM
    - 2.2Gs at 5 Earth masses and 1.5 Earth radii - phil - 4/24/2007 9:50:09 PM
      - Thanks Phil - Peter Bruener - 4/25/2007 5:03:02 AM
        
        AP says 1.6G; I don't get it (n/t) - phil - 4/25/2007 4:01:24 PM
        
        Either way it would be a great place to train athletes (n/t) - FrankC - 4/26/2007 9:43:21 PM
        
        That seems high. Jupiter is something like 2.3-2.4 with over 300 times the mass of Earth. (n/t) - REB - 4/25/2007 4:17:52 PM
        
        Huge Difference In Density - M.A.E. - 4/25/2007 9:27:29 PM
        
        How do they know the radius? - ER - 4/25/2007 10:30:48 PM
        
        They Don't - M.A.E. - 4/26/2007 2:17:47 AM
        
        Radius - depends on density which depends on compositionj which depends on.... - n - 4/25/2007 11:24:02 PM
        
        A relevant paper online... - Adam - 4/27/2007 2:04:02 PM
        
        re: That seems high. Jupiter is something like 2.3-2.4 with over 300 times the mass of Earth. - ER - 4/25/2007 4:59:18 PM
- re: ESO discovery ! - Raoul - 4/24/2007 8:50:06 PM
  - D'oh! 50% larger than the Earth, not smaller. - REB - 4/24/2007 8:57:43 PM

ISS and Progress pass - SteveS - 4/27/2007 4:21:45 AM

Ares 1 won't work? - Raoul - 4/26/2007 6:24:27 PM
- re: Ares 1 won't work? - SDG - 4/26/2007 7:29:35 PM

18 Scorpii, our Sun's twin - Raoul - 4/26/2007 12:08:55 PM

Enceladus - SteveS - 4/26/2007 2:35:37 AM

Pegasus to be launched live on NasaTV 13 minutes to go (n/t) - Raoul - 4/25/2007 8:13:07 PM

STEREO first 3D image of the Sun!! from NASA - Raoul - 4/23/2007 3:57:59 PM
- Oh, that is so COOL... - nick hoffman - 4/24/2007 2:06:38 PM
  - Darn. - REB - 4/24/2007 7:38:45 PM
  - re: Perhaps.... - Raoul - 4/24/2007 6:06:24 PM
    - Tasty - nick hoffman - 4/25/2007 7:06:00 AM
- Marvelous! - Jacob Samorodin - 4/23/2007 11:35:09 PM
- It'd be great if they posted stereo pairs... - podrock - 4/23/2007 8:00:39 PM
  - posted stereo pairs... - podrock - 4/24/2007 5:38:33 PM
  - re: Glasses - Raoul - 4/23/2007 8:25:47 PM
    - re: Glasses - nick hoffman - 4/24/2007 2:03:29 PM
    - re: Glasses - podrock - 4/23/2007 8:42:43 PM
      - re: Glasses - 3d glasses - 4/24/2007 12:48:28 AM

Physics "Reality does not exist when we're not observing it" - phil - 4/24/2007 1:17:09 PM
- Since the speed of light is finite, the whole concept of "when we're observing" is open to interpretation. (n/t) - ER - 4/24/2007 4:56:45 PM
- The LANGOLIERS - carl - 4/24/2007 4:23:28 PM
- Demand driven simulation, and "virtual" "reality" - Sawyer - 4/24/2007 2:03:05 PM
  - re: Demand driven simulation, and "virtual" "reality" - phil - 4/24/2007 2:11:01 PM
    - "Observe" in quantum physics merely means interaction with another particle - SDF - 4/24/2007 4:18:21 PM
      - gravitons may escape universe - Sawyer - 4/24/2007 8:39:15 PM
      - "Close your eyes, the universe will still be there when you open them again" Whew! (n/t) - phil - 4/24/2007 5:48:05 PM
        
        Yeah, but you're just a part of the illusion. - Lee - 4/25/2007 5:15:48 AM
        
        Hey, I'm an optimist. (n/t) - SDF - 4/24/2007 9:40:56 PM

Moon / Mars Budget Gutted? is it over before it began? - Jeff F - 4/24/2007 2:13:47 AM
- Planetary Society Urges Congress to "Restore NASA's Vision" - Jeff F - 4/24/2007 10:14:03 PM

Eta Carina Nebula - more HST marvels - Raoul - 4/24/2007 5:38:24 PM
- She's gonna blow!!! (n/t) - phil - 4/24/2007 5:49:24 PM
  - re:Too far south to witness it :-( (n/t) - Raoul - 4/24/2007 8:51:04 PM

Orbital surveillance satellites now exceed 1 inch resolution. - Robert Clark - 4/23/2007 10:00:00 AM
- What for? - ER - 4/24/2007 1:13:36 AM
- I'm no expert, but... - TB - 4/23/2007 5:41:17 PM
  - Orbital motion is a red herring - nick hoffman - 4/24/2007 8:02:19 AM
    - True... - TB - 4/24/2007 3:49:34 PM

XCOR - phil - 4/24/2007 2:06:15 PM

Earth and Moon photo? - TB - 4/24/2007 5:12:18 AM
- re: Earth and Moon photo? - claude bolls - 4/24/2007 11:23:23 AM

April 24 1967....40 years ago.... - Raoul - 4/24/2007 9:06:15 AM

« newer topics · page 230 of 740 · older topics »

Recent posts

On this day in Space/Science

Space/Science