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what hubble sees

  • fguihen
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what hubble sees was created by fguihen

Ok, the light from galaxies we see here on earth can have travelled many billions of light years to get to us, so the actual galaxy could be in a very different state than what we see it in as the light is so old. lets say we see light from a galaxy that has travelled 10bilion light years. Now hubble can see a lot further than us, so lets say it sees the light from the galaxy thats only 3bilion light years old, more recent images. why does the older light that we see not distort the image hubble sees, i mean, hubble focuses on a point far away, but all the light is still travelling toward us so along with seeing light that is 3bn years old, it also sees all the light that is 4bn years right up to what we see on earth. does that make sense? i jst want a bit of clarification. thanks all
"Success is the happy feeling you get between the time you do something and the time you tell a woman what you did." Dilbert.
16 years 3 months ago #34325

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Replied by pmgisme on topic Re: what hubble sees

Dead simple.
If you look at the moon with a tree in the foreground you can see both simultaneously.

You might see Jupiter behind the moon.

Behind Jupiter you might see, M35 say, if you have a binoculars.

And if you have Hubble to play with you might see a Quasar in the distance behind M35.

All at the same time. (Hubble would not see the tree of course.!)

Like hearing loads of people shouting at you from different distances !

Hope that helps.

Peter.
16 years 3 months ago #34326

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Replied by Maddad on topic Re: what hubble sees

I think you're spot on with that explanation, Peter. Hope that it makes sense for fguihen. Sometimes we get so used to knowing stuff like this that we forget the steps we took in learning it. He'll let us know if that account covered all of his bases.
16 years 3 months ago #34335

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Replied by albertw on topic Re: what hubble sees

Also the HST tends not to look at things that are blocked by other things.

The first Hubble Deep Field for example was taken of a patch of sky where there were no stars or galaxies previously known.
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
16 years 3 months ago #34339

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Replied by Seanie_Morris on topic Re: what hubble sees

Also the HST tends not to look at things that are blocked by other things.

The first Hubble Deep Field for example was taken of a patch of sky where there were no stars or galaxies previously known.


Which it subsequently found about 1,100 objects previously unkown... it was a 28 day exposure though!

S.
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
16 years 3 months ago #34352

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