H.E.S.S. gamma ray telescope got an image of the moon

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That is from Egret, not Hess.

It took 3 years to make that image. That tells you how difficult it would be to get a better image.
 
Noduagga said:
https://en.m.wikipedia.org/wiki/File:Moon_egret.jpg

Can we use better telescopes of this type (ground based gamma rays telescopes) to image the surface and subsurface of a planet with a lot of resolution?

you will find there's a lack of ground based gamma telescopes for a good reason. You don't get to see the original gamma photons as they are stopped by the atmosphere, fortunately for life on earth. Rather you get to see showers of secondary lower energy gamma photons after the originators collide with particles in the atmosphere.
Hence, if you want to see the original source gamma rays, you must do so from space ... i.e. from orbitDave
 
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davenn said:
you will find there's a lack of ground based gamma telescopes for a good reason. You don't get to see the original gamma photons as they are stopped by the atmosphere, fortunately for life on earth. Rather you get to see showers of secondary lower energy gamma photons after the originators collide with particles in the atmosphere.
Hence, if you want to see the original source gamma rays, you much do so from space ... i.e. from orbitDave
Well i don't mind if we can use this secondary particles to map the surface of a planet. Can we?
 
Noduagga said:
Well i don't mind if we can use this secondary particles to map the surface of a planet. Can we?

but do they have any idea of the origin direction of the source gamma ray when the angle of the shower particles are so spread out ?

As of yet, I haven't seen anything in print to that effect ... open to links for such:smile:

Dave

PS. lots more reading
The four telescopes in the VERITAS array each provide a different view of an air shower, providing a better fix on the direction of the incoming gamma ray.

emphasis on the words "better fix" so that does help narrow down the source direction a bit
 
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