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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!po.CWRU.Edu!smg6
- From: smg6@po.CWRU.Edu (Stanley M. Golem)
- Newsgroups: alt.alien.visitors
- Subject: Re: The Cursor Speaks Out!
- Date: 25 Jan 1993 05:55:16 GMT
- Organization: Case Western Reserve University, Cleveland, Ohio (USA)
- Lines: 69
- Message-ID: <1jvvc4INNd03@usenet.INS.CWRU.Edu>
- NNTP-Posting-Host: slc4.ins.cwru.edu
-
-
- This is reply to message 12865, posted by Mr. Richard Payne.
-
- In an earlier message, payner@netcom.com (Rich Payne) writes:
-
- >Detection of a wobble by photographic means has always seemed a bit
- >suspicious to me. It seems that the error must exceed the magnitude
- >of the wobble. Perhaps use of CCDs would reduce the errors. This is
- >something about which I have doubts, can anyone confirm the inaccuracies
- >present in photographic detection?
-
- Please read posts more carefully. Photographic detection of the type
- that you seem to refer to was not mentioned and, as you point out, would
- probably not detect a wobble. But I was not referring to this method.
- My fault -- I should have spelled out "interferometry," which can detect
- stellar diameters as small as 0.00041 arc-second, making use of the wave
- nature of light. This technique was first used with the 100-inch Mt.
- Wilson telescope back in the 1920's, so I assumed that anyone interested
- in the subject would be well aware of this.
-
- My original post said:
-
- >>One might raise the objection that these companions are too large to be
- >>called planets. If they are nonluminous and orbiting a star, I don't
- >>know what else you'd call them.
-
- >So you would call a black hole or a neutron star a planet? The universe
- >may be a bit young for black dwarfs, but these would also fit the bill.
- >But cooler expired stars might not be detectable due to their small
- >surface area.
-
- No, I would not call a black hole or a neutron star a planet. Don't be
- ridiculous! The only nonluminous bodies with masses well below that of
- the star they are orbiting are planets, at least as far as we know. If
- you have incontrovertible proof otherwise, you should share it with the
- rest of us.
-
- Again, try reading the original post more carefully. It says, given
- the existence of nonluminous bodies orbiting a star, I would call them
- planets rather than companion stars. I was refuting a possible objec-
- tion that they might be called stars in their own right. Is this such
- a hard sentence to understand?
-
- My post also said:
-
- >> In any case, their existence could
- >>not possibly hurt the chances of smaller planets being present. I
- >>hope this is useful.
-
- To which you answered:
-
- >Who knows? Honestly, how do you know. Suppose the sub-star inhabits the
- >habitibal zone (where liquid water is possible). Would that not affect
- >the possibility of life at that solar system?
-
- Come on! If you're going to take up other people's time by posting, at
- least put a little thought into it before you do so.
-
- I said that the existence of large gas giants could not hurt the chances
- of smaller planets being present. For proof of this, just look at our
- own solar system -- more than one huge planet and a good number of smaller
- ones, at least one of which supports intelligent (for the most part) life.
-
- Do you have trouble reading and understanding English, or are you simply
- intellectually dysfunctional?
-
-
- --
-