Space/Science « The HabitableZone

Mars; here we come. by johannes December 3, 2012 7:38 pm

A long way to go but I'm glad it's his mission by BuckGalaxy 2012-12-03 21:31:54
Log in to Reply
- Apollo cost $100G in today's dollars. by ER 2012-12-04 11:14:48
  Log in to Reply
  - Colonization ain't gonna happen. by bowser 2012-12-04 16:37:27
    Log in to Reply
    - It's not impossible, just unprofitable. by ER 2012-12-04 19:06:09
      Log in to Reply
      - So what's wrong with constant resupply from a home base? by TB 2012-12-04 20:24:07
        Log in to Reply
        The tensions facing this Earth and species won't allow those expenditures. by bowser 2012-12-05 17:08:05
        Log in to Reply
        You need a reason to go there. by ER 2012-12-04 23:24:46
        Log in to Reply
        Good point. by TB 2012-12-05 10:29:31
        Log in to Reply
        There's a lot of stuff in space we need here. by ER 2012-12-05 13:13:39
        Log in to Reply
        Not the Moon. Asteroids. Avoid gravity wells when you can. by TB 2012-12-05 21:29:43
        Log in to Reply
        The Belt is good... by ER 2012-12-06 09:02:24
        Log in to Reply
        There are innovative entrepreneurs investing in this. by TB 2012-12-06 11:52:04
        Log in to Reply
        I wish them the best of luck. by ER 2012-12-06 16:48:55
        Log in to Reply
        "Belt to the inner solar system is just as energy-expensive–you have to slow down when you get home." by alcaray 2012-12-06 11:06:47
        Log in to Reply
        True, but aero braking by ER 2012-12-06 17:07:17
        Log in to Reply
        We used to think that sending probes to other planets required using rockets to achieve orbit. by alcaray 2012-12-06 17:50:27
        Log in to Reply
        Gravity assists require precise planetary alignments. by ER 2012-12-06 18:36:19
        Log in to Reply
        "don't occur all that frequently..." by alcaray 2012-12-06 23:08:15
        Log in to Reply
        Sails were a kind of warp drive. by ER 2012-12-07 06:09:17
        Log in to Reply
        My point by alcaray 2012-12-07 12:22:24
        Log in to Reply
        I'm not just trying to pick a fight and prove I must be right. by ER 2012-12-07 12:50:04
        Log in to Reply

Re: Space exploration. US can't afford a joint ESA-US Europa trip. Can spend $400 million each on F-22s. by bowser December 6, 2012 4:16 pm

Localized warming by RobVG December 4, 2012 9:36 am

Actually the basic concept is simple. by johannes 2012-12-04 21:01:25
Log in to Reply
Do you ever wonder... by TB 2012-12-04 12:23:55
Log in to Reply
You're right. We don't understand. by ER 2012-12-04 10:05:58
Log in to Reply
- Nothing new, everything new. by bowser 2012-12-04 12:40:58
  Log in to Reply
- Very reasonable view. by TB 2012-12-04 11:26:27
  Log in to Reply
  - The S Hemisphere "anomaly" has already been explained. by ER 2012-12-04 12:11:18
    Log in to Reply

Looks as if the big Mars news was not what they found but what they thought they were going to find. by bowser December 3, 2012 12:54 pm

A word on the ramifications o the miscommunication. by alcaray 2012-12-03 17:33:56
Log in to Reply
- Not to worry. by bowser 2012-12-03 19:22:27
  Log in to Reply
It depends on what part of the story you read. by johannes 2012-12-03 15:14:02
Log in to Reply
What is chlorinated methane? Sounds like a "nerve gas precursor". by alcaray 2012-12-03 14:17:18
Log in to Reply

Why black holes don't suck. by ER November 27, 2012 7:01 pm

A 10 y/o plays football against the 49ers. by bowser 2012-11-30 13:52:58
Log in to Reply
- That's relativity. by alcaray 2012-11-30 21:36:57
  Log in to Reply
Your argument is valid, except for the fact that by johannes 2012-11-28 11:27:55
Log in to Reply
- Use or misuse of a word tells us nothing about what the word allegedly describes. by ER 2012-11-28 17:23:20
  Log in to Reply
  - Obsession about definitions? by johannes 2012-11-29 12:44:27
    Log in to Reply
    - Black Hole is a term coined by astronomers. by ER 2012-11-29 16:50:29
      Log in to Reply
      - You wrote that by johannes 2012-11-29 19:43:57
        Log in to Reply
        Newton was 99.99% right. by alcaray 2012-11-29 20:46:45
        Log in to Reply
        :) by TB 2012-11-29 20:07:48
        Log in to Reply
        It is interesting how an honest dialogue often turns towards the absurd. by johannes 2012-11-30 12:46:46
        Log in to Reply
        People saying absurd things will do that. by alcaray 2012-11-30 13:30:50
        Log in to Reply
        Tell me about it. by TB 2012-11-30 13:20:28
        Log in to Reply
- The galaxy is expanding? I don't think so. by alcaray 2012-11-28 12:31:25
  Log in to Reply
  - My reasoning is that by johannes 2012-11-28 14:21:40
    Log in to Reply
    - Objects that close are both red-shifted and blue-shifted... by alcaray 2012-11-28 23:43:45
      Log in to Reply
    - But stars and galaxies of stars were formed by gravity? Tthey formed by contraction. I by RobVG 2012-11-28 16:49:39
      Log in to Reply
      - Contraction, explosion, expansion. Perhaps. by johannes 2012-11-29 12:50:56
        Log in to Reply
    - Why not use your reasoning, instead, by ER 2012-11-28 16:28:26
      Log in to Reply
      - The concept of an experimental proof is very simple. by johannes 2012-11-29 12:41:53
        Log in to Reply
        No, Johannes. by ER 2012-11-29 13:10:59
        Log in to Reply
        Hmm, interesting by johannes 2012-11-29 15:00:27
        Log in to Reply
        Why make things so complicated? by alcaray 2012-11-29 16:51:36
        Log in to Reply
        The calculations? by johannes 2012-11-29 19:53:49
        Log in to Reply
        The calculations do not need to explain any theory to any layman. by alcaray 2012-11-29 20:49:47
        Log in to Reply
        You are assuming that it is the “mass” that causes the gravitational field. by johannes 2012-11-30 12:46:02
        Log in to Reply
        No I am not. by alcaray 2012-11-30 13:35:11
        Log in to Reply
        OK now that you read about it. by johannes 2012-11-30 20:39:06
        Log in to Reply
        I was hoping you would read about it. by alcaray 2012-11-30 21:11:50
        Log in to Reply
        I read it but did not get the an answer to my question. by johannes 2012-11-30 21:53:09
        Log in to Reply
        Your shields are impervious. I yield. by alcaray 2012-12-01 17:35:45
        Log in to Reply
        I KNOW!!!! johannes....you aren't even trying to see a different viewpoint. You are convinced you are right, and on that ... by Jody 2012-12-01 19:33:40
        Log in to Reply
        The shortest possible answer... by TB 2012-11-30 21:06:24
        Log in to Reply
        You have a good question. by johannes 2012-11-30 21:54:54
        Log in to Reply
        Correction by johannes 2012-11-29 15:01:21
        Log in to Reply
Well done, 4.0, except they do seem to suck, a lot, and blow, a little. by bowser 2012-11-27 23:21:11
Log in to Reply
- That's true, but... by ER 2012-11-28 04:49:18
  Log in to Reply
Excellent, thanks n/t by RobVG 2012-11-27 21:34:58
Log in to Reply

Why black holes still don't suck. by ER November 29, 2012 7:58 am

As with all conglomerations of matter, there is a center of gravity. by bowser 2012-11-30 01:55:03
Log in to Reply

A 12kg projectile is fired by Jody November 27, 2012 6:29 pm

The shape would be a factor, too. by bowser 2012-11-29 00:30:48
Log in to Reply
TA DA!!!!!!! You guys rock!!! by Jody 2012-11-28 17:31:42
Log in to Reply
What mischief are you up to Jody. I hope this doesn't involve Texas secession. by FrankC 2012-11-27 23:11:46
Log in to Reply
- LMAO!!! Frank...I'll save you! by Jody 2012-11-28 17:31:05
  Log in to Reply
On earth, at sea level, at the equator, fired towards the West, at a temperature of 80 degrees F, and 50% humidity? by alcaray 2012-11-27 22:21:50
Log in to Reply
- It is strictly about the weight ratio! by Jody 2012-11-28 17:32:50
  Log in to Reply
You have two identical bullets ... by RobVG 2012-11-27 21:00:13
Log in to Reply
- Anyone? Beuller? Beuller?... n/t by RobVG 2012-11-28 18:07:04
  Log in to Reply
  - They did it on mythbusters. by alcaray 2012-11-28 23:34:04
    Log in to Reply
12.5 Kilometers, 50 Kilometers by RobVG 2012-11-27 20:09:15
Log in to Reply
- Houston, we have a problem. An order of magnitude problem. by ER 2012-11-27 20:36:13
  Log in to Reply
  - I see my mistake. by ER 2012-11-27 20:40:55
    Log in to Reply
    - Corrected, in metric, our results agree. by ER 2012-11-27 20:58:58
      Log in to Reply
    - I used a ballistic trajectory calculator :p n/t by RobVG 2012-11-27 20:53:17
      Log in to Reply
      - You got the right answer. by ER 2012-11-27 21:00:51
        Log in to Reply
        Thanks for showing your work. by RobVG 2012-11-27 21:04:12
        Log in to Reply

Moon Grazes Jupiter by ER November 28, 2012 8:50 pm

I noticed their proximity last night. by alcaray 2012-11-28 22:06:21
Log in to Reply

Warp Drive breakthrough at NASA by BuckGalaxy November 28, 2012 12:01 pm

As soon as we figure out how to make a "negative vacuum energy ring" we will have it made. by alcaray 2012-11-28 12:40:39
Log in to Reply
- Free enterprise can do it. by ER 2012-11-28 16:21:48
  Log in to Reply

Are there any educated guesses as to what Curiosity has found? by bowser November 22, 2012 9:15 pm

Looks like it was a misunderstanding by BuckGalaxy 2012-11-28 12:04:37
Log in to Reply
Well, below I guessed... by alcaray 2012-11-23 01:31:56
Log in to Reply
- No, I'm tuned in... by podrock 2012-11-23 20:37:45
  Log in to Reply
  - Now there's a rumor that HUMANOIDS have been found there by Lindy 2012-11-24 18:35:13
    Log in to Reply
    - That's not the SAME Obama, is it? by caspar 2012-11-26 17:34:10
      Log in to Reply
    - Lindy, that was Jimmy Hoffa, and all that's left is his DNA. by bowser 2012-11-24 22:10:40
      Log in to Reply
- I read those, and think they are great guesses. by bowser 2012-11-23 09:41:08
  Log in to Reply
  - Don't get your panties in a wad.... by Lindy 2012-11-23 17:27:28
    Log in to Reply
    - Magic crystals, no doubt. by alcaray 2012-11-23 20:20:04
      Log in to Reply

Nested Universe? by RobVG November 26, 2012 9:28 am

I'm going out on a limb. by bowser 2012-11-26 22:22:13
Log in to Reply
More cooped than nested, I think. by alcaray 2012-11-26 18:45:44
Log in to Reply
here's my deal... by FrankC 2012-11-26 14:17:29
Log in to Reply
- If the mass goes to another dimension... by alcaray 2012-11-26 18:47:14
  Log in to Reply
  - By persistent I assume you mean we have never seen one of them stop functioning. by FrankC 2012-11-27 14:27:30
    Log in to Reply
    - Then your theory states that the mass hangs around inside the black hole for a while... by alcaray 2012-11-27 15:43:48
      Log in to Reply
      - Not necessarily by FrankC 2012-11-27 18:52:15
        Log in to Reply
        If the mass immediately goes there, then the mass immediately is not here. by alcaray 2012-11-27 19:40:45
        Log in to Reply
        So after a black hole is formed, what happens to the additional mass it consumes? by FrankC 2012-11-27 20:08:10
        Log in to Reply
        It's mass, demonstrably, is here. The effects of its mass are apparent. by alcaray 2012-11-27 22:17:49
        Log in to Reply
- Well, by RobVG 2012-11-26 15:05:44
  Log in to Reply
Well, this Universe has at least one boarder, me! by bowser 2012-11-26 13:07:33
Log in to Reply
- Maybe the universe is finite and unbounded. by ER 2012-11-26 13:26:40
  Log in to Reply
  - If the inflationary model of the universe continues to hold... by alcaray 2012-11-26 18:57:29
    Log in to Reply
    - Even without inflation, by ER 2012-11-26 20:53:23
      Log in to Reply
      - You don't need to hold a picture of a hypersphere in your head. by alcaray 2012-11-26 21:14:52
        Log in to Reply
        Inflation and Expansion are not the same thing. by ER 2012-11-26 22:43:42
        Log in to Reply
        Inflation isn't that new (unless you are trying to brag on how old you are). by alcaray 2012-11-26 23:10:32
        Log in to Reply
        And now the expansion is accelerating by RobVG 2012-11-27 09:08:20
        Log in to Reply
        I don't know if its actually bragging... by ER 2012-11-27 06:12:26
        Log in to Reply
  - You are certainly correct, especially with "may". by bowser 2012-11-26 13:39:42
    Log in to Reply
    - I don't think there is an "outside". by ER 2012-11-26 18:26:45
      Log in to Reply

Habitable Zone Cited in Physics Forums! by ER November 25, 2012 8:04 pm

It would be more exciting if a novamaker was heading in our direction. by alcaray 2012-11-25 21:17:11
Log in to Reply
- I think that was what Clarke had in mind. by ER 2012-11-26 06:04:33
  Log in to Reply
  - When I read it, it sounded like... by alcaray 2012-11-26 12:33:02
    Log in to Reply
Excellent! by podrock 2012-11-25 20:55:48
Log in to Reply

Page 128 of 160«1...126 127128129 130...160 »

Recent posts

The Control Panel