APOD: GRB 090423: The Farthest Explosion Yet (2009 Apr 29)

[aristarchusinexile]

Is that you done Chris P ???? Cos i have not even started?

No, just spent most of the day working with a new horse. Too tired to give this much more thought. Maybe tomorrow.

Quit hors'n 'round, pardner, and git back to that eyepiece .. the Martian herd is a'comin.

[Βουκέφαλος]

Just got this month's Sky and Telescope talking more about this GRB. This is my first post on The Asterisk* and I had several questions:

1. What is a good red-shift to distance calculator, or is that possible, and what might be the expected degree of error.
2. Chris indicated that matter could move faster than the speed of light? Is that right, or did I misinterpret?

3. If the universe is 14B years old, does that mean that we'll never find anything more than 14 GIGA-LY ?
4. But, if the answer to above is yes, then something that took 14 GLY to see, would actually be at least 28 GLY by now if the object would be traveling the speed of light?
5. But, WOULD the object be traveling the speed of light? Or faster? Or slower?

Thanks, I'm trying to understand some of these concepts that I've read in this thread.

[apodman]

Bucephalus or Buchephalas (Ancient Greek: Βουκέφαλος, from βούς bous, "ox" and κεφαλή kephalē, "head" meaning "ox-head") (c. 355 BC – June, 326 BC) was Alexander the Great's horse and the most famous actual horse of antiquity.

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3. If the universe is 14B years old, does that mean that we'll never find anything more than 14 GIGA-LY ?
4. But, if the answer to above is yes, then something that took 14 GLY to see, would actually be at least 28 GLY by now if the object would be traveling the speed of light?

There are some posts in this topic that might help.

Also, use the search box at the top of the page to search all posts in this forum for "comoving distance" or just "comoving".

[BMAONE23]

an interesting site for distances to the stars and beyond
this one is good too