141–150 of 254 posts
Downvote me to hell, but as a person who has zero understanding of what differentiates Hubble from Webb, the pictures alone just aren't doing it for me. I was excited to see something completely new given 30 years and 10 billion dollars and instead I feel like I'm seeing what looks like an enterprise upgrade and feel slightly disappointed. What am I missing?
Not trying to underscore this incredible achievement, but I'm curious if we could use AI techniques to upscale the Hubble images to achieve similar results as the Webb telescope. Has this been tried before?
Searching for this stuff is kind of hard (information overload), so I'm wondering if anyone here has more up to date info.
I'm actually most looking forward to seeing a picture of our planets. I wonder what kind of resolution we'll get of Jupiter and Mars in particular. Also curious about what the closest stars to our solar system would look like. Of course it also makes me wonder what would we be able to see given a 100x increase in aperture. Like for example if we could send up something extremely large on Starship. Would we be able to…
1. Can the telescope be pointed in any direction? (of course, orthogonal to the suns rays, I understand the need to cool it down).
2. If it can be pointed, I am assuming some boosters would be used to pivot it. How long do these last?
3. Is there any info on the orbit? Can the orbit degrade?
4. All the fluid / gas required to correct / point, can it be refilled?
So, I have a few questions. 1. Can the telescope be pointed in any direction? (of course, orthogonal to the suns rays, I understand the need to cool it down). 2. If it can be pointed, I am assuming some boosters would be used to pivot it. How long do these last? 3. Is there any info on the orbit? Can the orbit degrade? 4. All the fluid / gas required to correct / point, can it be refilled?
https://jwst-docs.stsci.edu/jwst-observatory-hardware/jwst-m...
Here's a backyard telescope versus Webb: https://twitter.com/AJamesMcCarthy/status/154694183270093209... More comparisons on Twitter, some zoomed in: - https://twitter.com/Batsuto_/status/1546899241880240128 - https://twitter.com/Batsuto_/status/1546900387931766784 - https://twitter.com/JBWillcox/status/1546881033597075457 - https://twitter.com/jason4short/status/1546626672488632321 I'm not a physicist, so I've only…
They're not lens flares, but they're still an artifact of the system, which is probably what most people mean by "lens flare" anyway, due to lack of a better common term.
https://en.wikipedia.org/wiki/Photographic_filter#Cross_scre...
So, I have a few questions. 1. Can the telescope be pointed in any direction? (of course, orthogonal to the suns rays, I understand the need to cool it down). 2. If it can be pointed, I am assuming some boosters would be used to pivot it. How long do these last? 3. Is there any info on the orbit? Can the orbit degrade? 4. All the fluid / gas required to correct / point, can it be refilled?
2. Basically any satellite in use today uses spinning masses which it can speed up or down to change the direction it's looking. Angular momentum is conserved, but direction pointing isn't. Eventually due to uneven forces (eg, from the sun), these reaction wheels become "saturated" and some propellant is used slow the wheels down. Current estimates put the fuel running out in more than a decade.
3. It's an orbit in L2, past the Earth from the Sun's view. This orbit is unstable, and some of the fuel will also be used to maintain this orbit.
4. There is no refilling mechanism built in. It's likely once the propellant is out the mission will be done. There is the possibility of another spacecraft grabbing onto James Webb and pushing it for station keeping, but it wouldn't be able to refill it. One major innovation with the James Webb though is that it's refrigerator is closed loop, as otherwise running out of coolant would be the mission limiting factor.
Bug report: On Firefox the difference wiper thing doesn't appear for the last image (Carina Nebula), it only shows the full Webb image.
funny enough that one didn't work on chrome but worked in firefox nightly albeit a distorted version that only showed the top left corner of it... I'm not sure hubble shot the full version? https://i.imgur.com/oBK3sWE.png
Earlier quoted context omitted.
Apparently the Diffraction spikes come from both the primary mirror shapes and the struts holding the secondary mirror. The primary mirrors of the JWST are hexagonal which would explain hexagonal looking effects. The three struts are apparently designed so that two of the struts match the hexagonal mirror angles at all times and are "hidden" inside. (The third strut apparently sometimes causes two much smaller "horiz…
Link to that Hank Green video on YouTube: https://m.youtube.com/watch?v=Y7ieVkK-Cz0
Thanks!