Space Forum / Space Science / February 2004

Hi folks, I hope this is not off-topic for the group.
I was wondering if there is any practical method of space
propulsion that doesn't depend on a reaction force (i.e. firing
some kind of matter out the back in order to accelerate

-> Are the winds strong enough to whip up waves that will cut
-> cliffs in the lakesides? Will they form steep beaches, or will the
-> strong tides caused by Saturn's gravity be a bigger effect,
-> forming wide, shallow tidal flats?  

For those wanting to see more color composites of MER pancam images, I put
some on the following web page. No flames about "true color," please--no
warranty expressed or implied, or fitness for any particular purpose:
http://www.copperas.com/mercolor

There have been a few peeks to the outside area both distant and close.
Why are there no signifcant visible chunks of material thrown from
the crater? Do small impact craters sites vaporize everything leaving
few if any large chunks in a debris field?. Im curious how that works.

I would like to know why we don't travel to Mars by first lifting many
loads of fuel to the space station.  The actual spaceship would be
assembled in space, at the space station, from parts that are lifted
there the same as the fuel is lifted, by conventional rockets.  Perhaps

Our first look into a mars rock at the Opportunity site.
<http://marsrovers.jpl.nasa.gov/gallery/all/1/m/030/1M130859762EFF0454P2959M2M1.JPG>
Close up:
<www.skyhound.com/dl/wtf.jpg>

See half donut shaped feature on Sol 54 Spirit microscope images
Has anyone any ideas what this feature is - looks like nothing I've
ever seen - looks as thogh it's a tube like structure with a piece of
wall broken away - is this a result of RAT activity or are we seeing

February 26, 2004
Now it's Art.
http://themis.asu.edu/zoom-20040225A.html
To me, it's melting ice sheets, which implies water, which implies life,

Hi, I an very curious about something! Hope I can articulate my
question.
The question is relating to gravity and earth's position in space.
Imagine you are traveling towards earth. If you were to travel towards

what it says that the temperature  when bigbang happened was 100 million
trillion trillion  degrees ,   but the temperature is caused my random
movements and colliding of particles. if space it self was created by
bigbang, there should not  have been much space to accumulate all ...

http://www.jpl.nasa.gov/mer2004/daily/2-27-04.cfm
Spirit Status for sol 54
Heading To 'Humphrey'
posted Feb. 27, 5 pm PST

What is the current "accepted" explanation of a comet's antitail?
The antitail is not an opticial illusion or an illusiont by
perspective. It's a real spike towards the sun. Some astronomers
mumble "old dust ejected some weeks before", which it cannot be,

Here's an article that CNN has about nuclear power on space probes.  I
list some questions about it below
http://www.space.com/businesstechnology/technology/nuclear_focus_040218-
1.html

The "white" thing 100 meters away on the top right part of the image.
Is that the Spirit shield ?
http://www.lyle.org/mars/imagery/stereo/2-130990593-P.jpg (anaglyph 3D)
ERic

(lower right)
http://marsrovers.jpl.nasa.gov/gallery/press/opportunity/20040225a/xpe_First_Opp
_RAT-B032R1.jpg
http://marsrovers.jpl.nasa.gov/