Questions tagged [space-telescope]

Questions regarding telescopes in orbit around Earth, such as the Hubble Space Telescope.

Filter by
Sorted by
Tagged with
1 vote
0 answers
12 views

What is stopping Event Horizon Telescope the size of the Earth’s orbit?

There is a proposal to include a radio sensor in a telescope going to the Sun-Earth L2, getting 120x improvement in angular resolution to EHT. Knowing nothing about interferometry, it seems pretty ...
user avatar
  • 111
7 votes
0 answers
90 views

How are the occurrence and nature of micrometeoroid impacts on JWST optics identified?

There are been recent news about a larger-than-expected micrometeoroid impact on the James Webb Space Telescope's optics. Apparently this was one of several impacts that have already been observed. ...
user avatar
  • 1,194
1 vote
1 answer
77 views

How far above the galactic plane would a telescope array need to be in order to image the whole galaxy?

I hope this isn't a stupid question, but Google searches are turning up nothing relevant. I was just thinking about how it's difficult for us to determine the true shape and composition of the Milky ...
user avatar
  • 615
1 vote
1 answer
36 views

What do the letters WHL and LS stand for in the description and name of Earendel star, and other distant objects?

Earendel star's official name includes the abbreviations WHL and LS, as do some other very far-off objects.... What do they stand for?
user avatar
  • 3,375
2 votes
0 answers
44 views

How exactly does SPHEREx implement 96 spectral bands with a linear variable filter across its focal plane?

JPL's mission page for SPHEREx says: The mission will create a map of the entire sky in 96 different color bands, far exceeding the color resolution of previous all-sky maps. Wikipedia's SPHEREx ...
user avatar
  • 31.5k
4 votes
1 answer
164 views

In what measure James Webb Telescope "exceeded expectations"?

It is in all the news that the first images of James Webb Telescope "exceed expectations", but in what features? resolution?
user avatar
  • 49
4 votes
2 answers
535 views

What is "Charged time" in JWST ERS proposals?

In the Early Release Science proposals for the JWST such as this one, there is a "Charged Time" rubric. What is it? What is done during this time?
user avatar
  • 16.8k
7 votes
1 answer
169 views

JWST First Image With Star 18x - Which image is from which mirror?

The James Webb space telescope first image showing the same star 18 times with the unaligned mirrors is great. How do they tell which image corresponds to which mirror? see Photons Received: Webb Sees ...
user avatar
20 votes
2 answers
5k views

How many pixels could an image of Proxima b taken by James Webb have?

I know it's very difficult for the James Webb to image Proxima b without an external coronograph (I have been told by NASA scientists that they don't know yet whether they will be able to do so), but ...
user avatar
  • 301
3 votes
1 answer
155 views

What does the celestial sphere look like in thermal IR?

The Space SE question JWST detector heat load asks ...what is the heat load from the collected radiation of the main mirrors on the detector, and how does that vary depending on what objects or ...
user avatar
  • 31.5k
1 vote
1 answer
247 views

What is the maximum magnitude that the JWST can safely observe?

Similar to Can JWST be damaged by looking at a bright star?. I'd like to know the brightest magnitude that the James Webb Space Telescope can safely observe without damaging any of its instruments. ...
user avatar
6 votes
2 answers
175 views

Does a star shaped mirror present problems either optically, or in signal processing over a more nearly circular mirror?

Pure speculation about a future replacement for the JWST that I almost certainly won't live to see. The JWST's mirror (and then some) would fit unfolded and flat into the Starship's 8m diameter ...
user avatar
  • 69
1 vote
1 answer
55 views

How does IXPE measure polarization, and why does it have three identical X-ray telescopes?

From The Observatory: Anyone who missed any of the AAS 239 press conferences can see them on the AAS Press Office's YouTube channel! Here's the full program. From there I found the Monday, January ...
user avatar
  • 31.5k
7 votes
2 answers
998 views

Which JWST instrument modes are compatible with observations of the bright trans-Earth planets Mars, Jupiter, and Saturn? Which aren't?

My comment says: ...answers to the Space SE question Can James Webb take pictures of our solar system? In what ways will they differ from/compliment those from Hubble? suggest that at some point JWST ...
user avatar
  • 31.5k
6 votes
2 answers
137 views

Will the James Webb Space Telescope need re-alignment of primary mirror segments?

I couldn't find an answer to this question. James Webb Space Telescope will align primary mirror segments and secondary mirror in space. Question is whether these will need re-alignment during the ...
user avatar
1 vote
1 answer
50 views

How many asteroids were discovered via GAIA? Is there a list?

The ESA Science & Technology video Gaia's asteroid discoveries shows trajectories for hundreds of asteroids that were seen by GAIA, but as far as I can deduce from the extensive notes there, only ...
user avatar
  • 31.5k
2 votes
1 answer
58 views

Are there any space-based observatories that use interferometry?

Ground-based interferometers such as ALMA have enabled many discoveries. It seems like sending a fleet of small telescopes would be feasible (smaller telescopes are easier to send into space than ...
user avatar
  • 16.8k
10 votes
4 answers
3k views

Why do satellites appear as streaks in telescope images?

Can you explain me in simple words why the satellite in this telescope image appears as a streak? The exposure time is 1 second.
user avatar
  • 111
1 vote
2 answers
75 views

Detection of the existence of any extraterrestrial life

We can't see things in "real-time" but we see the "past versions" of the things because it takes time for the light from that object to travel to us. So looking far away means ...
user avatar
  • 113
2 votes
0 answers
64 views

What new fundamental knowledge could a very, very large optical telescope bring? [closed]

Very large baseline radio telescopes bring many mysteries of the cosmos to us. We build them because they are feasible. Say, in the future, we could build very large optical telescopes in deep space, ...
user avatar
-4 votes
2 answers
147 views

Telescope/s functioning from underground mines

Theoretically and Practically, Can a Telescope function for the astronomer observed from underground mines? By "telescope" I mean the instrument used by astronomers to observe stars, planets ...
user avatar
1 vote
1 answer
94 views

Why do space telescopes have GRISMS? Why a grating AND a prism for cross-dispersion in slitless spectroscopy?

https://hst-docs.stsci.edu/wfc3ihb lists the page 8.2 Slitless Spectroscopy with the UVIS G280 Grism which contains details of one of the GRISMs of the Hubble Space Telescope (GRISM = Grating + Prism)....
user avatar
  • 31.5k
3 votes
1 answer
207 views

Why is the Nancy Grace Roman Space Telescope's field of view shaped like a PacMan "ghost"?

The Curious Droid YouTube video NASA's Mega Hubble - The Roman Space Telescope illustrates the shape of the telescope's field of view and the outline has a smile or frown shape. For whatever reason it ...
user avatar
  • 31.5k
2 votes
1 answer
94 views

What is the nature of the "blind spot issue" in asteroid detection systems?

From Wikipedia's "Asteroid impact prediction" article: Performance is improving in detecting smaller objects as existing systems are upgraded and new ones come on line, but the blind spot ...
user avatar
  • 123
2 votes
2 answers
124 views

How much are the benefits of installing a telescope in orbit?

I know that our atmosphere acts like a protective blanket letting only some light through while blocking others. We send telescopes to orbit to get a clearer view of space objects. I want to know that ...
user avatar
  • 207
1 vote
0 answers
36 views

What kind of space telescope could best take advantage of orbiting far from the Sun?

While Hubble has provided an astounding amount of science from low Earth orbit, one of the reasons it was put in LEO was to be readily accessible for service and upgrades by the Space Shuttle. JWST ...
user avatar
  • 31.5k
2 votes
0 answers
86 views

What would it take to view "the whole EM spectrum"?

I know the EM spectrum goes off both ends, but nearly everything anyone has bothered to use it for has wavelengths between $10^8$m (ELF) and $10^{-12}$m or so (gamma rays). So for the purposes of this ...
user avatar
  • 243
6 votes
3 answers
133 views

Do telescope measurements (in meters, usually) measure in a straight line, from edge to edge, or follow the curve of the mirror?

Somehow, no site or book or magazine has clarified this question for me.... Perhaps I am an idiot, but, Is the parabolic primary mirror on the new James Webb Space Telescope (JWST) 6.5 meters from ...
user avatar
  • 3,375
9 votes
2 answers
2k views

Why aren't there any images of Sun-orbiting bodies by Spitzer?

Why didn't the Spitzer space telescope shoot images of (dwarf) planets around the Sun, or did it? Even though its primary goal was to detect (the characteristics of) exoplanets, it could have revealed ...
user avatar
  • 1,538
1 vote
0 answers
20 views

Can (neo)WISE detect the coolest Y-dwarfs?

The WISE telescope discovered some Y brown dwarfs already. Is the neoWISE mission able to detect even the coolest ones (such as Y9 dwarfs) within five light-years distance? If so, the telescope would ...
user avatar
  • 1,538
5 votes
1 answer
175 views

What (if any) capabilities of Hubble are unique and irreplaceable? What can it do that can't be done by any other ground or space-based telescope?

It's impossible to summarize in an SE post the depth and breadth of the contributions to science made using the Hubble Space Telescope. Above the atmosphere it has access to an extremely dark and ...
user avatar
  • 31.5k
1 vote
1 answer
137 views

When thermal infrared space telescopes spot asteroids, are they seeing the body's own thermal emission, or reflected TIR from the Sun?

From the Space SE question Why has the Earth-Sun libration point L1 been chosen over L2 for NEOCam to detect new NEOs?: above: Profoundly not-to-scale illustration of NEOCam in an orbit around the ...
user avatar
  • 31.5k
1 vote
2 answers
136 views

How exactly can the Hubble Space Telescope see up to 15 billion light years?

I've been researching about the Hubble Space Telescope on nasa.gov, and I've read that Hubble uses a digital camera to take pictures like a cell phone. That's all I've found so far. I can't find any ...
user avatar
  • 73
3 votes
1 answer
90 views

Details on the telescope(s) on the Chinese Space Station 天和

The ISS has a telescope on board. Does the Chinese Space Station have one on board as well? I heard about Xuntian aka Chinese Space Station Telescope (CSST), but not too many details. Would that be ...
user avatar
  • 5,294
14 votes
3 answers
2k views

Is the measurement of distance and position of remote celestial bodies accurate?

Considering that light is affected by gravity, how accurate are measurements of distant stars and galaxies? When light passes through objects with great mass, such as Jupiter size planets, stars, or ...
user avatar
  • 263
2 votes
0 answers
19 views

Is the measurement of distance and position of far away objects accurate? [duplicate]

Considering that light is affected by gravity, how accurate are our measurements of distant stars and galaxies? When light passes through objects with great mass, such as Jupiter size planets, or ...
user avatar
  • 263
0 votes
1 answer
64 views

Did the Spectr-R space-based radio telescope use on-board accelerometer to measure non-gravitational acceleration for baseline correction?

This answer to Why is space-based VLBI scattering sub-structure "Hopefully, a new promising tool to reconstruct the true image of observed background target(s)"? summarizes the contribution ...
user avatar
  • 31.5k
22 votes
4 answers
8k views

Why is Starlink polluting the night sky a big concern if we have space telescopes?

There's a lot of concern in the Astronomy community over the deployment of Starlink satellites. For a good discussion, see the related question How will Starlink affect observational astronomy? But ...
user avatar
3 votes
1 answer
88 views

Are X-ray telescopes with glancing angle surfaces basically "funny-looking" Cassegrain telescopes mathematically?

In this answer I included the image below of a reflective X-ray telescope. It is made from two elements; the first is concentric shells of glancing (high incidence) angle paraboloidal surfaces, and ...
user avatar
  • 31.5k
4 votes
1 answer
141 views

Has GAIA learned anything about General Relativity looking near Jupiter? (Gerry Gilmore: "oblate rotating mass moving in a deeper (Solar) potential")

From Gerry Gilmore (2018) Gaia: 3-dimensional census of the Milky Way Galaxy 4.4 Fundamental physics Relativistic effects are highly significant for Gaia measurement accuracy, with tests of General ...
user avatar
  • 31.5k
8 votes
2 answers
597 views

Why (the heck) is the basic angle of GAIA 106.5°?

This answer to Why does the Gaia space telescope have two main mirrors says: According to the GAIA FAQs which does an excellent job: http://www.cosmos.esa.int/web/gaia/faqs: Why is there an angle of ...
user avatar
  • 31.5k
2 votes
1 answer
96 views

What would "the next GAIA"-like instrument be like? Could it simply be a 3 to 5x scaled-up version of the same beautiful system?

This excellent, thorough and well-sourced answer to Has a gravitational microlensing event ever been predicted? If so, has it been observed? mentions several works where hundreds to thousands of ...
user avatar
  • 31.5k
5 votes
1 answer
944 views

How many space telescopes are currently active?

Hubble, Chandra, XMM-Newton, Kepler,... I can name a few off of the top of my head, but how many space telescopes are there in all? Related What are the next planned space telescopes?
user avatar
  • 16.8k
3 votes
1 answer
37 views

Is sky-glow affected by height?

I'm an architecture student and my graduation project will consist of building a research center for outer space, my question is whether or not height would affect sky-glow or not ? Thanks in advance, ...
user avatar
3 votes
1 answer
73 views

Why wasn't CHEOPS data taken during passage through the South Atlantic Anomaly downlinked in this case, resulting in gaps in photometry?

Section 4.1.2. CHEOPS in Six transiting planets and a chain of Laplace resonances in TOI-178 says Due to the low-Earth orbit of CHEOPS, the spacecraft-target line of sight was interrupted by Earth ...
user avatar
  • 31.5k
4 votes
1 answer
161 views

Why does Nancy Grace Roman = 100 × Hubble? Why is the new space telescopes wide field camera so much wider than the old one's?

The title of the WFIRST project description (before it was named the Nancy Grace Roman Space Telescope) is The Wide Field Infrared Survey Telescope: 100 Hubbles for the 2020s. Question: Why does Nancy ...
user avatar
  • 31.5k
2 votes
0 answers
35 views

How do HabEx's internal coronagraph and external starshade work together and complement each other? What is it that each can do that the other can't?

Limits of space telescope? links to the video 4 Future Space Telescopes NASA wants to build and that page links to The New Great Observatories. These cover the four space-based instruments proposed by ...
user avatar
  • 31.5k
2 votes
1 answer
66 views

Limits of space telescope?

Watching this video describing the "next generation" space telescope, it seems like the biggest mirror will be ~6 meters in diameter. Theoretically, if a telescope was built in space instead ...
user avatar
2 votes
1 answer
113 views

(Thought Question) What would a giant far away mirror look like to a telescope?

If there was a theoretically perfect mirror the size of say, our solar system, somewhere out in space that had a focal point of literally earth. What would that look like to a space or earth telescope?...
user avatar
  • 203
4 votes
0 answers
122 views

Deciding optical factors between a refractive and reflective space telescope optics as a function of aperture? (visible light)

Reading Yale News' Lighting a path to Planet Nine: To detect objects that are otherwise undetectable, Rice and Laughlin employ a method called “shifting and stacking.” They “shift” images from a ...
user avatar
  • 31.5k