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re: NASA just completed the James Webb Space Telescope
Posted on 11/7/16 at 9:44 pm to LucasP
Posted on 11/7/16 at 9:44 pm to LucasP
So what happens when the first month it is out there a pea size piece of space rock traveling at 40,000 mpH smashes into and destroys it ?
Its not in our atmosphere so space junk is free game
Its not in our atmosphere so space junk is free game
0
Posted on 11/7/16 at 9:50 pm to Lou Pai
quote:
Seriously, how does this affect our ability to get Tom Herman?
So, you're part of the I'm With Herman crowd?
Posted on 11/7/16 at 9:52 pm to DavidTheGnome
Is this some big deal?
Posted on 11/7/16 at 9:58 pm to DavidTheGnome
One interesting tidbit from the article. It claims that due to big bang the universe is expanding and the faraway galaxies we see are baby galaxies....how could we possibly know if we are looking at younger or older galaxies?
Posted on 11/7/16 at 10:13 pm to bamafan1001
Standard candles: by knowing the brightness of relatively common object in the universe(supernovae), you can easily figure out how far away an object(i.e. a galaxy) is by measuring that objects brightness in that galaxy.
Posted on 11/7/16 at 10:17 pm to Python
Had to brush up on my astronomy myself....actually can't wait to see the images from this new telescope. Pretty exciting stuff
Posted on 11/7/16 at 10:36 pm to DavidTheGnome
How in the hell are they going to do repairs and service? It would be kind of difficult to park an Orion capsule next to it. No arm to capture it.
Posted on 11/7/16 at 10:40 pm to DavidTheGnome
quote:
James Webb Space Telescope
Does it throw grenades?
Posted on 11/8/16 at 3:46 am to buffbraz
I can't wait to see images, we just saw Pluto in color for the first time last year. It's interesting, but necessity being the mother of invention also makes space exploration something we shouldn't abandon.
I remember when voyager 1 was launched.
I remember when voyager 1 was launched.
This post was edited on 11/8/16 at 3:53 am
Posted on 11/8/16 at 6:05 am to DavidTheGnome
"Nearly 20 years after its engineers began construction, Nasa began testing this week on the largest space telescope ever built..." How long did it take to build the Hoover Dam? Interstate 10? The Superdome?
Posted on 11/8/16 at 6:10 am to DavidTheGnome
Honeycomb's big, yeah, yeah, yeah.
Posted on 11/8/16 at 7:25 am to DavidTheGnome
it must have some pretty good way to collapse and expand. That thing isn't fitting on any rocket as is. Hopefully that all works out since we can't send a shuttle out to fix it if something gets stuck.
Posted on 11/8/16 at 8:07 am to tigerpawl
quote:
How long did it take to build the Hoover Dam? Interstate 10? The Superdome?
This telescope is one of the most sophisticated machines ever built with some of the most sensitive electronics man has ever tried to make.
Hubble had issues at first and required "tuning"... I hope our scientists have learned those lessons or we will have to find a way to "hook up" with the telescope sans space shuttle
This post was edited on 11/8/16 at 8:12 am
Posted on 11/8/16 at 8:11 am to Tigeralum2008
quote:
This telescope is one of the most sophisticated machines ever built with some of the most sensitive electronics man has ever try to make.
Yep, they had to invent several technologies to make it work. Stuff like that takes time. And they only have one shot to get it right, so I'd rather they not rush it.
Posted on 11/8/16 at 8:15 am to buffbraz
Right but that doesn't tell us the age of the galaxy
Posted on 11/8/16 at 8:25 am to bamafan1001
quote:
Right but that doesn't tell us the age of the galaxy
Predicting the age of a galaxy in astronomy is a pretty standard concept these days. There is plenty of literature on it.
Posted on 11/8/16 at 8:26 am to bamafan1001
See here for how far back in time it can see.
How Far Will Webb see?
Because of the time it takes light to travel, the further away an object is, the further back in time we are looking.
This illustration compares various telescopes and how far back they are able to see. Essentially, Hubble can see the equivalent of "toddler galaxies" and Webb Telescope will be able see "baby galaxies". One reason Webb will be able to see the first galaxies is because it is an infrared telescope. The Big Bang caused the universe (and thus the galaxies in it) to expand, so most galaxies are moving away from each other. The most distant (and thus youngest) galaxies are moving away so quickly that the light they emit gets shifted towards the red end of the spectrum. This is very similar to listening to a train whistle shifting from higher to lower frequency as it passes by. Because visible light from faraway, quickly moving, “high redshift” galaxies is shifted to the infrared, infrared telescopes, like Webb, are ideal for observing these early galaxies.
How Far Will Webb see?
Because of the time it takes light to travel, the further away an object is, the further back in time we are looking.
This illustration compares various telescopes and how far back they are able to see. Essentially, Hubble can see the equivalent of "toddler galaxies" and Webb Telescope will be able see "baby galaxies". One reason Webb will be able to see the first galaxies is because it is an infrared telescope. The Big Bang caused the universe (and thus the galaxies in it) to expand, so most galaxies are moving away from each other. The most distant (and thus youngest) galaxies are moving away so quickly that the light they emit gets shifted towards the red end of the spectrum. This is very similar to listening to a train whistle shifting from higher to lower frequency as it passes by. Because visible light from faraway, quickly moving, “high redshift” galaxies is shifted to the infrared, infrared telescopes, like Webb, are ideal for observing these early galaxies.
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