Questions tagged [space-telescope]

A telescope placed in space, typically for the purpose of avoiding atmospheric distortion, background light, and attenuation of light by the atmosphere.

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Telescope in a crater? How different are the bowl shapes?

When building large stationary single-dish radio telescopes, one of the constraints to location is that the landscape should already have approximately the right shape, cutting down on construction ...
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What is NEOCam's (now NEO Surveyor) strategy for scanning the sky? Need to consider in which coordinate system?

In Survey Simulations of a New Near-Earth Asteroid Detection System it can be seen that Infrared astronomer Amy Mainzer gave the scanning strategy of the horizon in a paper, but I am very confused ...
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Is the Hubble Space Telescope on its last legs, or "back to normal"?

Hubble was designed to accommodate regular servicing and equipment upgrades while in orbit. Instruments and limited life items were designed as orbital replacement units. Five servicing missions (SM 1,...
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What will (likely) be the first separately-orbiting coronagraph to be deployed in space?

Traditionally a coronagraph is something that blocks the bright disk of our Sun to make it easier to image the much dimmer corona. The first coronagraph is of course the Moon; during a solar eclipse ...
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Why was the Rossi X-ray Timing Explorer decommissioned in 2012? Why wasn't it deployed another ~100 km higher where drag would have been a lot less?

The Rossi X-ray Timing Explorer (1995-074A) was an incredibly prolific space telescope between 1996 and when it was decommissioned/deactivated on January 5, 2012. It reentered the atmosphere soon ...
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How will NEO Surveyor manage 82 gigabits/day of data? How will it process it, what fraction will be sent to Earth and how it compares to TESS & GAIA?

Wikipedia says says: NEO Surveyorformerly called Near-Earth Object Camera (NEOCam), then NEO Surveillance Mission, is a planned space-based infrared telescope designed to survey the Solar System for ...
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What causes GAIA rotational axis to precess the way it does? How exactly is this accomplished?

The GAIA spacecraft rotates at 1 degree per minute about its axis, scanning two telescopes looking 106.5 degrees apart but imaging on the same focal plane around a circle every 6 hours. The rotation ...
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How do spacecraft reach Lagrange points?

As I understand, to reach a Lagrange point the spacecraft would need to slow down. Also, can spacecraft passing nearby Lagrange points get captured within the point?
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Future plans and advances for improved extrasolar planet imaging; has anything changed since 2019?

I have seen What is the state of the art of exosolar planet imaging in 2019? but answers there simply address the types and quality of images. Here I'd like to ask about plans for future technology to ...
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Most realistic 2021 rendering of the milky way galaxy [closed]

Images of our own galaxy are either the "edge-on" inside view or artist renditions. However, we have mapped out 2% of the stars. Most stars are red dwarfs, so the more luminous stars will be ...
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Are spacecraft star cameras ever used as scientific instruments for research?

There are quite a lot of spacecraft that have been up there a while and a lot of them have star cameras for attitude determination and for attitude control. Space telescopes (both heavenly and Earth-...
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Which spacecraft far from Earth have arc second resolution cameras that could measure Betelgeuse's position?

All hands on deck! We have to measure the distance to Betelgeuse ASAP because Recent headlines saying that Betelgeuse is much closer than we thought, and they point to Standing on the Shoulders of ...
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What's the status and timeline for Millimetron? (Russia's 10m Deployable Antenna cooled to 6 K Earth-Space VLBI)

Comments below an answer to How does NASA's ASTHROS stratospheric telescope compare to its James Webb space telescope? link to JPL's Paul F. Goldsmith's The Renaissance of High Resolution ...
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What "improvements in technology" allowed the primary mirror of RST (WFIRST) to be less than 1/4 the weight of Hubble's?

The recent NASA press release Primary Mirror for NASA’s Roman Space Telescope Completed states: While it’s the same size as the Hubble Space Telescope’s main mirror, it is less than one-fourth the ...
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What exactly gives a larger field of view to the donated "spy" telescopes that NASA may send to Mars? How much larger?

This answer to Could one of the interstellar probes discover Planet IX by accident? links to Space.com's NASA May Launch Donated Spy Satellite Telescope to Mars which says: An unexpected gift The two ...
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How does JWSTs ISIM direct light into its detectors?

I came across this diagram in the JWST User documentation which explains how light is directed into the ISIM (Integrated Scientific Instrument Module): But the ISIM contains four detectors (MIRI, ...
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Would it have been cheaper and/or faster to put a James Webb-like Space Telescope on a balloon instead of a rocket?

I've just noticed the following items: CNET: NASA to send stadium-size balloon skyward to study the cosmos JPL/NASA News: NASA Mission Will Study the Cosmos With a Stratospheric Balloon Even in 2020 ...
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Do crew movements or movement of other objects ever affect space or Earth observation experiments staged on the outside of ISS?

The ISS serves as a platform for both Earth and astronomical observational instrumentation. Do routine movements of the crew or other objects ever cause problems for these observations through ...
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Will WFIRST and JWST be able to resolve each other?

The James Webb Space Telescope is scheduled to launch in 2021 and be put in a halo orbit around Sun-Earth L2 soon after. The plan for the Wide Field Infrared Survey Telescope is a launch perhaps ...
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Is it possible to control the operation of the Hubble Space Telescope from ground stations?

Is it possible to manage the placement of the telescope mirror in a specific location through the operator, or do we have to randomly view the data reflected to the telescope ?
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At what wavelengths and for what particle types have astronomical objects been imaged or at least directionally resolved from the ISS?

The ISS has an X-ray telescope called NICER and this answer in Astronomy SE (and links therein) explain that it was able to show that there are hot spots clustered near one pole of the pulsar PSR ...
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What would be merits of placing space telescope after the asteroid belt or closer to the Kupier belt?

I want to know what difference does it make, in terms of observations made and the benefits for the astronomical society if we place a space telescope after the asteroid belt or near the Kuiper belt. ...
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Use of carbon nanotube based black colourings like Vantablack in space

I've seen several articles talking about the ways in which Vantablack and similar substances could be used in space as a replacement for black paint. For example, they could be used on the optical ...
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Will the James Webb Space Telescope be able to see the Spitzer Space Telescope (assuming...)?

Space.com's NASA's Spitzer Space Telescope is no more. Here's what's next for infrared astronomy. says: The best infrared eye in the universe† has closed, and scientists will need to wait at least a ...
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James Webb Space Telescope's Golden Mirror's reflectivity for infrared and visible light

The mirror of the James Webb Space Telescope was plated with gold for a better reflectivity of infrared light. It reflects also red light well but not blue. Conventional telescope mirrors were plated ...
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For a given 48 hour observing period, what fraction of the celestial sphere is available to CHEOPS?

Wikipedia's CHEOPS says that when successfully launched and deployed it will be in a 700 km circular Sun-synchronous orbit with "RAAN (sic): 6 am" which probably means it has an inclination of almost ...
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Turn a Planet Labs satellite into a (small) "Hubble"?

If we revert a satellite of Planet Labs to look planets of the solar system or deep space, would we obtain a good result? A space telescope (above atmosphere) is automatically better than a ground-...
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What is the name of the new NEO searching telescope "heavily based on" NEOCam? (now NEO Surveyor)

Space.com's NASA Wants a New Space Telescope to Protect Us All from Dangerous Asteroids quotes "Thomas Zurbuchen, associate administrator for the Science Mission Directorate" several times, ...
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Are space camera sensors usually round, or square?

A series of round lenses produces a round image on some sort of sensor or sensor array. When it comes to cameras and telescopes out in space, are the sensors also round? It seems like most of the ...
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Why does this photo of the Hubble Space Telescope look so weird?

Question: Can someone identify this photograph of the Hubble Space Telescope seen as a still in the Los Angeles Times YouTube video Scientists witness huge cosmic crash, find origins of gold, figure ...
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Why are JWST optics not enclosed like HST?

The Hubble Space Telescope encloses its primary and secondary mirrors in a tube. The James Webb Space Telescope has no tube around its optics, which obviously leads to significant mass savings. Does ...
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Why have JWST in a Sun-Earth L2 halo orbit?

What is the main reason JWST will be in a halo orbit around the Sun-Earth L2 LaGrange point? There have been questions on this site that ask Why won't JWST deploy in LEO where it is potentially ...
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Are there specific location/locations where a solar gravitational lens telescopes would be placed?

I was thinking about solar-gravitational lens telescopes and it occurred to me that a particular telescope would likely have to be selected in opposition to a particular small spot of sky. That is, ...
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Main issues space telescopes face when pointing in the same general direction as the Sun?

What are the main issues that space telescopes face when pointing at objects that are in the same general direction as the Sun? Why do they generally schedule their observing for objects in the ...
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Solar system sized telescope and resolving details of the M87 black hole

In this video Katie Bouman mentions that an earth sized telescope needs to be used for getting images like the M87 Black Hole: Stellar distances are estimated using ...
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What was the average temperature of space near the Spitzer Satellite Telescope?

The Spitzer Space Telescope, formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space telescope launched in 2003, to be retired in January 2020. The temperature of space near ...
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Why a polar orbit for TWINKLE?

TWINKLE will use a 0.45 meter telescope to record spectra of stars transited by their exoplanets. By looking at tiny changes in the spectrum as the planet's atmosphere moves in front of the star, they ...
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Why did the Herschel Space Telescope need helium coolant?

Inspired by answering this question The Wikipedia entry says this On 29 April 2013, ESA announced that Herschel's supply of liquid helium, used to cool the instruments and detectors on board, had ...
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What's the largest optical telescope mirror ever put in space?

As a follow-on question to What's the largest optical lens put in space? I'd like to ask about mirrors this time. Question: What's the largest optical telescope mirror ever put in space? Optical ...
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What's the largest optical lens put in space?

While star cameras and wide angle cameras in space are built from glass lenses, large aperture optical systems generally use reflective optics. For some large ones see answers to What's the largest ...
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Why aren't space telescopes put in GEO?

I don't know of any space telescope that has been placed in geosynchronous orbit among the communication satellites. I wonder why not? In GEO, a space telescope could use a single stationary radio ...
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How fast do optical surfaces get dirty or damaged in space?

These answers: (1, 2) to Do things get dirty in space? mention the Hubble Space Telescope but if I understand correctly refer to the outside of the telescope rather than its optical surfaces. Answers ...
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Roughly what fractions of the time did Skylab spend in Earth-oriented and Sun-oriented attitudes?

The Introduction section of NASA Technical Memo TM-X-64628 Angular momentum desaturation for Skylab using gravity gradient torques begins: The Skylab Apollo Telescope Mount (ATM) experiments require ...
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Can we see the USA flag on the Moon from Earth? [duplicate]

Is it possible one day to see landing site flags on the Moon from Earth or from space without having to land using a telescope as technology progresses? Highly Related: Were the Apollo lunar ...
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How would 2 JWSTs make stereo pictures?

Could 2 JWST be launched in opposite directions to provide stereo vision? Would a stereo picture provide any benefit? https://space.stackexchange.com/a/35402/18879 Related: How will JWST manage ...
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Can we make super-massive Telescopes to image exoplanets?

This question has already been partly addressed here: When will we have the technology to directly observe an exoplanet with significant clarity? However, my question is focused more on the ...
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Why Orion can't be used to service JWST?

Hubble Space Telescope is a marvel of astronomical tools - particularly judging by how much it moved the science. It took a lot of fixes along the way, which certainly prolonged its useful life. Its ...
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Could Breakthrough Starshot proposed propulsion system be used in a regular size probe to accelerate it faster than any probe has been before?

Supposedly Breakthrough Starshot project wants to accelerate a capsule of the size of a mobile phone - according to one source - and of the size of the chip of a mobile phone - according to another ...
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Why is the Hubble Space Telescope mass increasing? [duplicate]

According to this Youtube video I came to know that the mass of the Hubble space telescope has increased from the time of launch. What is making this mass increment? Are these the debris?
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What are the percentages of matter in the universe, and how did we find out? [closed]

What are the percentages of matter in the universe? And how did we find out about it?