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AcidRainLiTE
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What is the farthest visible star (observed by telescope) and what is the estimated distance?
Thanks.
Thanks.
-Job- said:I know that, I'm only wondering, if we could, whether it would look very different.
Chaos' lil bro Order said:Furthest star is UDF 00411 with a redshift of z=6.080000
Furthest object is the galaxy(galaxy cluster?) ABELL 1835:[PSR2004] 1916 with a redshift of z=10.001750
Its quite incredible to think that we can see a redshift of 10, astronomy has come so far, its very exciting.
Chaos' lil bro Order said:Job, yes the Universe would look much brighter if all starlight reached us without having to take light years to reach us. There was a thought experiment that reasoned that the Universe could not be infinite in expanse because the night sky would be perfectly lit up with no dark spaces if it were. However, this never considered the fact that light takes time to reach us, so in fact the Universe could be infinitely large and the stars we see today are remnants of light sent out long, long ago. Its strange to think that many of the stars we see in the sky do not exist anymore, since they could have easily novaed millions of years ago, but their light that we see was sent out billions of years ago.
matt.o said:I can assure you the cluster Abell 1835 is not at redshift 10, it is at redshift 0.25, in fact I would wager good money that you won't find any clusters of this size above redshift 2 or 3. There was a paper reporting the detection of a redshift 10 galaxy lensed by Abell 1835, but a later deeper observation failed to detect signatures of a redshift 10 galaxy.
see this paper for more;
http://arxiv.org/abs/astro-ph/0412432"
Chaos' lil bro Order said:Check this link, is it out of date or inconclusive?http://nedwww.ipac.caltech.edu/cgi-bin/nph-allsky?z_constraint=Larger+Than&z_value1=9&z_value2=&z_unit=z&flux_constraint=Unconstrained&flux_value1=&flux_value2=&flux_unit=Jy&frat_constraint=Unconstrained&ot_include=ANY&nmp_op=ANY&ra_constraint=Unconstrained&ra_1=&ra_2=&dec_constraint=Unconstrained&dec_1=&dec_2=&glon_constraint=Unconstrained&glon_1=&glon_2=&glat_constraint=Unconstrained&glat_1=&glat_2=&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES
Looking at your "search" results but paying attention to the details it provided -- it says ABELL 1835 has a SPEED of 10.001750 km/s and a z= 0.0 (well within matt.o limit of 3). Best re-read your link; looks like an error in the search not the detail.Chaos' lil bro Order said:Check this link, is it out of date or inconclusive?http://nedwww.ipac.caltech.edu/cgi-bin/nph-allsky?z_constraint=Larger+Than&z_value1=9&z_value2=&z_unit=z&flux_constraint=Unconstrained&flux_value1=&flux_value2=&flux_unit=Jy&frat_constraint=Unconstrained&ot_include=ANY&nmp_op=ANY&ra_constraint=Unconstrained&ra_1=&ra_2=&dec_constraint=Unconstrained&dec_1=&dec_2=&glon_constraint=Unconstrained&glon_1=&glon_2=&glat_constraint=Unconstrained&glat_1=&glat_2=&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES
(ref:)
Furthest object is the galaxy(galaxy cluster?) ABELL 1835:[PSR2004] 1916 with a redshift of z=10.001750
I see, the line I was trying to read is almost indecipherable the way it’s displayed.matt.o said:No, it says ABELL 1835:[PSR2004] 1916 is at z=10, but you should read the references provided when you click on the "refs" link (there are 4).
Just to be clear, Abell 1835 is the lensing cluster. It is lensing the proposed redhift 10 object called "ABELL 1835:[PSR2004] 1916".
The farthest visible star is currently known to be GN-z11, located in the constellation Ursa Major. It is estimated to be around 13.4 billion light years away from Earth.
The distance of a star is measured using a unit called a light year. One light year is equal to the distance that light travels in one year, which is approximately 9.46 trillion kilometers. Scientists use various methods such as parallax, spectroscopy, and Cepheid variables to calculate the distance of a star.
It is difficult to observe the farthest visible star because its light has taken billions of years to reach Earth, making it very faint and difficult to detect. Additionally, the expansion of the universe causes the light from these distant stars to be stretched and shifted towards the red end of the spectrum, making them even harder to observe.
No, the farthest visible star cannot be seen with the naked eye. Even with the most powerful telescopes, it appears as a tiny, faint speck of light. However, with advanced technology and future advancements in space exploration, we may be able to see it more clearly in the future.
The study of the farthest visible star can provide valuable insights into the early universe and its evolution. By observing the light from these distant stars, scientists can study the composition, temperature, and other properties of the universe in its early stages. This can help us better understand the origins of the universe and how it has evolved over billions of years.