- Original Message -
From: "John Sheff" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Europa Icepick" <[EMAIL PROTECTED]>
Sent: Tuesday, August 21, 2001 1:16 AM
Subject: Re: Notes on deep-space propulsion
>
>
> Thanks for the explana
Thanks for the explanation regarding ion drives of the DS-1 class not being
intended for outer-planet exploration.
One wonders, however, why it will not be used on the MESSENGER mission to
Mercury - an inner-planet mission if there ever was one! Instead, MESSENGER
will follow a long, looping
- Original Message -
From: "John Sheff" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, August 01, 2001 8:29 PM
Subject: Re: Gary McMurtry's question
> At 08:02 PM 8/1/01 -0400, [EMAIL PROTECTED] wrote:
>
>
> >In a message dated 7-31-01 7:45:13 PM, [EMAI
