Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

academo.org

Post reply on HN
Print view View original

31–37 of 37 posts

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#31

Post by Azrael3000 »

outputchannel wrote: post #9
Azrael3000 wrote: post #6

Earlier quoted context omitted.

There's no drifting there. What you are seeing is gravitational lensing. The light of (most likely a galaxy) is bent around another galaxy or star which distorts its appearance. Also this means it can potentially show up multiple times on the image (e.g. opposite side w.r.t. the lensing object)

Thanks for the comments! It does look like some stars may be exhibiting stellar drift, I've isolated an example here: https://academo.org/demos/james-webb-vs-hubble-telescope-com... This is from the middle-right side of the deep field. If you look slightly below the two central galaxies, there is what looks to be a foreground star (I say that due to its brightness and the fact it has a starburst effect) and between t…

Fair enough, I misinterpreted GPs post. He and you are obviously correct.

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#32

Post by q1w2 »

RcouF1uZ4gsC wrote: post #25

As an aside, does anyone on HN know why one telescope’s name includes a first name and the other doesn’t. We don’t call the first telescope the Edwin Hubble Space Telescope

Webb is a much more common surname than Hubble.

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#33

Post by q1w2 »

outputchannel wrote: post #9
Azrael3000 wrote: post #6

Earlier quoted context omitted.

There's no drifting there. What you are seeing is gravitational lensing. The light of (most likely a galaxy) is bent around another galaxy or star which distorts its appearance. Also this means it can potentially show up multiple times on the image (e.g. opposite side w.r.t. the lensing object)

Thanks for the comments! It does look like some stars may be exhibiting stellar drift, I've isolated an example here: https://academo.org/demos/james-webb-vs-hubble-telescope-com... This is from the middle-right side of the deep field. If you look slightly below the two central galaxies, there is what looks to be a foreground star (I say that due to its brightness and the fact it has a starburst effect) and between t…

It might also be caused by parallax. The image might have been taken at different points in the Earth's orbit around the sun.

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#34

Post by gumby »

RcouF1uZ4gsC wrote: post #25

As an aside, does anyone on HN know why one telescope’s name includes a first name and the other doesn’t. We don’t call the first telescope the Edwin Hubble Space Telescope

I think it's because they are two syllables. After a short time objects named after people* (Carnegie Mellon, FDR Drive etc) tend to lose the association with the person so honored and just become strings. This is doubly so for names of international scope.

Think of Google, Facebook, Netflix, Workday, Coinbase: two syllables, each name an iamb (which is especially effective in English). Sure, there are numerous counterexamples (microsoft, Amazon), but generally the corners get knocked off and even turn into acronyms in public usage (GM, GE).

Single syllables are too short for infrequently used words (this appears to be true for any language) -- you don't want to waste a lot of time saying "am" since you say it a lot; when you say "biceps" you want enough variability that your brain has time to parse it.

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#35

Post by outputchannel »

q1w2 wrote: post #33
outputchannel wrote: post #9

Earlier quoted context omitted.

Thanks for the comments! It does look like some stars may be exhibiting stellar drift, I've isolated an example here: https://academo.org/demos/james-webb-vs-hubble-telescope-com... This is from the middle-right side of the deep field. If you look slightly below the two central galaxies, there is what looks to be a foreground star (I say that due to its brightness and the fact it has a starburst effect) and between t…

It might also be caused by parallax. The image might have been taken at different points in the Earth's orbit around the sun.

That's a really good point. I think there's a high chance that the photos were taken from quite different locations because Hubble orbits the earth at 570km, whereas JWST is actually at the L2 Lagrangian point, which is about 1.5 million km away from Earth.

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#36

Post by privong »

hrnnnnnn wrote: post #30
privong wrote: post #24

Earlier quoted context omitted.

> Exoplanets are too far away and too small to image directly. If you mean resolving details of the exoplanet, then yes that is currently true. But we have imaged exoplanets directly, meaning taken an image of a star where one can also see the planet directly in the image. [0] has a list of directly imaged exoplanets. [0] https://en.wikipedia.org/wiki/List_of_directly_imaged_exopla...

Woah didn't know about that. The gif on that page is incredible!

It's an impressive technique. Direct imaging finds planets that would be unlikely to be identified via other detection techniques (such as measuring the wobble in the parent star's radial velocity or measuring photometric eclipses as the planet passes between us and the parent star).

Re: Show HN: A JWST/Hubble deepfield comparison on a zoomable/pannable map interface

#37

Post by Azrael3000 »

revskill wrote: post #4

These are annoying to me because lacks of real difference from a senior astronaut viewpoint. As a normal user, the only difference i could see is just "brighter", anything more to add to the details ? Else i could say, just the same.

Check out the video by Scott Manley, he explains quite a bit: https://www.youtube.com/watch?v=0FWO1Pvbhq4
Post reply on HN