Aucbvax.6317
fa.space
utcsrgv!utzoo!decvax!ucbvax!space
Fri Feb 26 03:35:40 1982
SPACE Digest V2 #116
>From OTA@S1-A Fri Feb 26 01:31:22 1982

SPACE Digest                                      Volume 2 : Issue 116

Today's Topics:
				 Quasars
			    Wierd accelerators
		       flying short, stubby I-beams
				 Quasars
----------------------------------------------------------------------

Date: 25 Feb 1982 0716-PST
From: Paul Dietz <DIETZ AT USC-ECL>
Subject: Quasars
To: Reed.ES at PARC-MAXC
cc: space at MIT-MC

Gravitational redshift is ruled out because the redshift is so great.
A large cluster of stars (say) of sufficient density to get that redshfit
would be unstable to gravitational collapse.

If the quasars are local objects associated with our galaxy, calculations
indicate that the energy necessary to accelerate them to their observed
velocities is many, MANY solar masses, far too much to be believable.
And why don't we see them around other galaxies, blue-shifted?

Some evidence for the traditional view includes the fact that quasars
resemble less active radio galaxies in that they have radio lobes,
and the observation of a gravitational lens involving a quasar.  This
last doesn't work unless the quasar is very far away.
-------

------------------------------

Date: 25 Feb 1982 09:40 PST
From: Stewart at PARC-MAXC
Subject: Wierd accelerators
To: Space@MIT-MC
cc: Stewart

Take the skyhook rope, tie a probe on the end, and whirl the affair around a
suitable asteroid.  As the rope wraps around the asteroid, the probe will reach 0.5
c and then you let go.

At least as feasible as the bloater drive.

	-Larry

PS  Remind me to write up my wood burning TV receiver.

------------------------------

Date: Thursday, 25 February 1982  09:41-PST
From: KING at KESTREL
Subject: flying short, stubby I-beams
To: ota at s1-a
cc: King at KESTREL, space at mit-mc

	I seem to remember that the strength required of an object  of
a given design to resist a  given acceleration is proportional to  the
cube root of its mass.  (All load-bearing members' cross sections  are
proportional to the square of a linear dimension, and the the mass  of
the object is proportional to the cube.)
	If I remember correctly, the  strength of structural steel  is
approximately 1000 KPSI.   If I wanted  to send an  I-beam to  another
galaxy, the load on  its base would have  to be 
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This Usenet Oldnews Archive
article may be copied and distributed freely, provided:

1. There is no money collected for the text(s) of the articles.

2. The following notice remains appended to each copy:

The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996 
 Bruce Jones, Henry Spencer, David Wiseman.