Spotting craters on Mars

[Guest John S]

Those of you interested in astronomy might like to have a look at

http://clickworkers.arc.nasa.gov/top

 

Basically you'll be helping NASA to find craters on Mars, simply by clicking on four points on the crater rim.

 

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John Suffill

 

john@go-fishing.co.uk

[Guest dave k]

John

If you are interested in astronamy try having a look on my brothers site.

he is into it in a big way http://www.thekennedys.net/Home.nsf/Liams%...ea!OpenFrameSet

 

He goes out into the desert most wekends to star gaze

 

 

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dave kennedy

 

[This message has been edited by dave k (edited 12 January 2001).]

[Guest John S]

Cheers Dave, I'll do just that

 

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John Suffill

 

john@go-fishing.co.uk

[Guest loonyl]

Ta Dave & John

Looks good.

 

I've been looking at the moons of Jupiter

over the last few days

 

Very impressive.

 

Cosmic even

(as those that don't get out

much, would say )

 

What I don't understand, ok

 

is that the light travels zillions of miles

over billions of years to get to us.

 

Then , we can just go out into the back yard

use little more than an shaving mirror

and a magnifying lens, and distort and magnify them there same light rays/particles.

in any way we wanna.

 

Kinda weird,

what makes the curvature of a shiny

piece of glass change light SOOO much

that the last zillion miles, and billion

years didn't have such an effect?

 

Cheers

Liam

[Guest John S]

Originally posted by loonyl:

what makes the curvature of a shiny

piece of glass change light SOOO much

that the last zillion miles, and billion

years didn't have such an effect?  

 

It does. As it travels through space, light can be bent and distorted as it passes near galaxies (for eg). Imagine two galaxies placed one behind the other in relation to us - the light from the galaxy furthest away will be bent as it passes by the closer galaxy so that to us on Earth, we see multiple images (the Einstein Cross). I remember a computer generated image from NASA that showed the light-path taken by several distant objects, and believe me those light-paths were going all over the place before they finally got to us.

[Guest loonyl]

Originally posted by John S:

It does.  As it travels through space, light can be bent and distorted as it passes near galaxies (for eg).  Imagine two galaxies placed one behind the other in relation to us - the light from the galaxy furthest away will be bent as it passes by the closer galaxy so that to us on Earth, we see multiple images (the Einstein Cross).  I remember a computer generated image from NASA that showed the light-path taken by several distant objects, and believe me those light-paths were going all over the place before they finally got to us.

Aye John,

 

I've seen a picture of them,

they kinda look like crosses

all over the joint.

 

What I meant was,

It takes a huge mass of a galaxy,

white dwarf etc to bend te light,

ie a HUGE thing

 

whereas a likkle shaving mirror will

bend it (or reflect it 180 degrees)

any way we want it to go.

And we can even make a guess where its

gonna bend to.

 

Seems like major voodoo to me

 

Cheers

Liam