Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [telescope]

Telescopes are devices that collect data (usually electromagnetic spectrum, visible or otherwise) to better resolve distant objects.

1
vote
1answer
39 views

What optical design is used by the GEDI's receiving telescope and how is the secondary held in place?

GEDI is a sophisticated LIDAR instrument now on its way to the ISS. Once installed, it will use powerful laser pulses (10 mJ, 242 Hz) from several lasers to map height in 3D, collecting multiple ...
3
votes
1answer
223 views

How did Skylab's electrographic camera work?

This answer links to history.nasa.gov's SP-404 Skylab's Astronomy and Space Sciences. In what looks like chapter 2, page 14 there is mention of Skylab's electrographic camera, shown below. In the ...
1
vote
0answers
63 views

How to start with back yard space exploration? [closed]

I am completely noob to space science. Recently, I visited to my cousins and found amazing experience of observing Moon with telescope. The one that they uses is "Monocular Outdoor High Definition ...
3
votes
1answer
75 views

Would we be able to see a Space craft transit in Lunar orbit?

If a Apollo type Moon mission happened today would we be able to see it transit in Lunar orbit? I know we can't see the Landing sites of the Apollo but could we see the Command Module and its shadow ...
1
vote
1answer
93 views

Is there any Scientific Benefit to the Lower Albedo levels on the Darkside of the Moon?

I was reading the answers to this question: What did the sky actually look like from the Moon? And it got me thinking... What, if any, astronomy tasks could be performed better on the lunar far side ...
3
votes
2answers
99 views

To use a gravitational lens as a telescope, does the hypothetical user have to do so from a given angle?

This question is about the use of a gravitational lens for example of a distant galaxy or sun. I’m curious to know whether the two outer masses, say galaxies or suns (when to the observers of course) ...
0
votes
0answers
23 views

How can I find which chemical compounds can be seen on Titan's surface?

Titan has a thick atmosphere made up of mostly molecular Nitrogen and Methane which absorbs light and blocks the surface to telescopes, save for certain "spectral windows" (the white portions in the ...
4
votes
2answers
100 views

What is the process to produce a chemical composition spectrum of a celestial body?

I have come across this spectrum, which depicts the chemical composition of Titan's atmosphere: Taken from here. I would like to know how do scientists generate such spectra, starting with capturing ...
1
vote
1answer
52 views

Recommended source for familiarizing oneself with the applications of spectroscopy in planetary science

I have recently entered the field of planetary science as a limited-scope project which is part of my masters' degree in chemistry. My project is going to revolve around Titan and its complex organic ...
2
votes
0answers
78 views

Technology to directly observe an exoplanets [closed]

I would like to know what number of space telescopes, ideally mass produced ones using current technology and that could be cheaply manufactured and launched en-mass via the future SpaceX BFR. How ...
4
votes
4answers
292 views

Could a 21 meter space telescope detect the nearest exoplanets?

For reference, Hubble's mirror is 2.4 meters wide, the upcoming James Webb's 6.5 meters, and the proposed ATLAST 8 or 16 meters. Let's assume a mirror nearly ten times Hubble's size, 21 meters, is ...
4
votes
2answers
380 views

Does the Hubble telescope use a “simple” PID-controller for its pointing control system?

I am wondering whether the Hubble Space Telescope uses a "simple" PID controller like this: Or is it using another type of control system that may be much more complex?
7
votes
1answer
760 views

Has any ground-based telescope taken a picture of a geostationary broadcast satellite?

I can't find 1 image, but I've heard there are a lot of geostationary satellites. Hovering in one specific spot in the sky, rotating with the Earth's spin and tilt, rotating with Earth's orbit around ...
-2
votes
3answers
321 views

How come we can see nearby galaxies but are unable to see TRAPPIST-1?

How do we have telescopes that are powerful enough to see nearby galaxies, such as Andromeda (M31), but are unable to see TRAPPIST-1 or the other exoplanets in its solar system in detail when TRAPPIST-...
0
votes
0answers
37 views

Why put a telescope on moon? [duplicate]

According to this report: As a follow-on mission to India's first space X-ray observatory, ASTROSAT, ISRO is planning to set up a telescope on moon.ISRO chairman A S Kiran Kumar said that the ...
17
votes
3answers
2k views

What's the largest aperture telescope sent beyond the Earth-Moon system?

The question and answer about telescopes sent to different planets got me wondering. There are so many solar system bodies that have been photographed by deep space spacecraft, planets, dwarf planet(s?...
10
votes
2answers
339 views

What savings allowed James Webb telescope to be lighter than Hubble?

Wikipedia states: The telescope has an expected mass about half of Hubble Space Telescope's, but its primary mirror (a 6.5 meter diameter gold-coated beryllium reflector) will have a collecting ...
16
votes
5answers
3k views

Would a lunar telescope provide a significant improvement over terrestrial based equipment?

As I understand it, the moon makes for an ideal location for a telescope because it offers environmental factors that are unlike anything achievable on earth: A lack of atmosphere, light pollution, ...
1
vote
0answers
76 views

How powerful a telescope would be needed to equal New Horizons'? [closed]

New Horizons has sent back some amazing, unexpected photos of Pluto. I'm sure there are people who would love to build a larger version of Hubble that could continue imaging Pluto at a similar ...
6
votes
1answer
1k views

Is there a telescope on board the ISS?

I am wondering if there is a telescope in or outside the ISS that has been used for astronomical imaging? I have seen here that there is already a Celestron telescope on board but it is only used for ...
4
votes
0answers
94 views

What is the Dark Matter Particle Explorer telescope?

China's new mission DAMPE will launch a dark matter particle telescope to detect and study the evidence of dark matter. How does this telescope work? What is expected from the mission?
11
votes
2answers
1k views

Picture of equipment left on the Moon?

When people visited the Moon, they left sizeable items behind. I know that taking picture of this from Earth is incredibly hard, but: Did someone try? And what pictures do we have?
16
votes
4answers
4k views

Why do some space telescopes require cooling (sometimes down to 3K)?

Space is already cold, so why do some space telescopes require cooling? Ex: infra-red telescope What kind of cryocoolers are used, and why?
1
vote
1answer
131 views

What observatory had the best optical telescope in the 1960's, based on faintest apparent magnitude it could image? [closed]

I found a table of historically largest telescopes here, so I'm guessing it's the Hale Telescope of the Palomar Observatory on Mount Wilson. However, that Wikipedia article warns that size is not ...
17
votes
3answers
3k views

Were the Apollo lunar activities observed from Earth?

I understand that all manned landings on the Moon were on the near side, so technically they could be visible from Earth. Was it possible to observe landings and/or extravehicular activities (EVAs) ...
3
votes
1answer
117 views

Are we using software to analyze our telescope data? [closed]

It seems like to me all our analysis of stars and planets could be automated. A computer looks through the data for anomalies and then performs additional observations for that area and then outputs a ...
8
votes
1answer
130 views

Finding non-lit objects at light minute ranges

Let's say my hyperjumpwarpgate McGuffin drive goes bing and I find myself about half a light year away from the sun. This is right in the heart of the outer Oort Cloud. Wikipedia says that there are a ...
8
votes
1answer
2k views

Aren't the mirrors of the James Webb Space Telescope too unprotected?

I've looked at the design of the James Webb Space Telescope and I got curious about something, some years ago, it seems that the international space station was hit by micro-meteorites. I'm wondering ...
11
votes
1answer
345 views

What are the current state in plans to put a liquid telescope on the moon or in space?

The utility of using liquid metals or ionic salts to automate casting of a telescope mirror could offer a cheap way to build a massive telescope on the moon or in space. The image above, along with ...
6
votes
3answers
1k views

Why is taking a picture of the moon surface from earth possible but taking one of an artificial satellite is difficult?

After reading this question and seeing an image of ISS shot from earth, a doubt came in mind that if shooting moon from earth with high details is possible, why is it difficult to shoot artificial ...
11
votes
2answers
4k views

Was Hubble really related to spy satellites?

Around the launch of the Hubble Space Telescope, I remember comments in the media that the Hubble may be related to certain espionage satellites. The Hubble was designed and built around the time that ...
7
votes
1answer
113 views

How is WISE continuing to work without coolant?

In October 2010, the Wide-field Infrared Survey Explorer (WISE) ran out of the coolant it needs for its IR detectors to work, so it's mission ended. In August 2013, NASA powered up WISE again with a ...
4
votes
1answer
1k views

Would placing an X-ray telescope on the surface of the Moon be a good idea?

Instead of placing an X-ray telescope in orbit or deep space, would building an X-ray telescope on the surface of the Moon an good idea, since it has no atmosphere? If no, please don't forget to ...
10
votes
1answer
235 views

Why would Kepler’s pointing problems be minimized if aimed within the ecliptic?

Having read a few articles on the suggested new uses for the crippled Kepler space observatory with only two out of four functioning reaction wheels, several ideas suggest that Kepler’s pointing ...
12
votes
1answer
2k views

Why was the Hubble Space Telescope purged with nitrogen gas?

Wikipedia states that The telescope had to be kept in a clean room, powered up and purged with nitrogen, until a launch could be rescheduled. Spacecraft are always kept in a clean room ...
7
votes
5answers
4k views

What are the advantages and disadvantages of sending a telescope into deep space? [closed]

When I first heard of the Voyager missions I thought this: why not do the same, only make it a telescope? I thought it would surely see a lot of things we can't see from Earth or the inner Solar ...
7
votes
2answers
410 views

Has any satellite proved the hypothesis that the Sun could be used as a gravitational lens?

Has any satellite proved the statement that the Sun's gravity could be used as a magnifying lens, focussing electromagnetic waves of distant galaxies or other celestial objects? Or, is this idea, for ...
0
votes
1answer
346 views

What type of telescope should I use in order to view the surface of the moon? [closed]

I am wondering what type of telescope I could use to see the surface of the moon. I am fascinated by seeing marks of human feet.
2
votes
0answers
62 views

Would it be possible to create a community-built array-style radio telescope? [closed]

Using off-the-shelf technology, would it be possible to create a community-built array-style radio telescope? Much like the Very Large Array or Square Kilometer Array but using home grown antennae ...
8
votes
1answer
556 views

Can multiple space telescopes be grouped together to explore the space

On Earth one can group multiple telescopes to observe a specific region. They can be moved around and focus different areas. Also they give a higher resolution of the area they observe. Would this be ...
33
votes
3answers
18k views

When will we have the technology to directly observe an exoplanet with significant clarity?

Are there currently any projects underway to develop a telescope which will have the ability to directly observe an exoplanet with any clarity? I don't mean blurry (yet impressive) images like this ...
30
votes
2answers
3k views

Why should the James Webb Space telescope stay in the unstable L2?

We all know that James Webb Space telescope is planned to be launched in 2018. It has been decided that the orbit of JWST will be elliptical around the Lagrange point L2, which has been declared as ...
9
votes
3answers
336 views

What is the current state of affairs concerning space telescopes?

With the Hubble telescope to be decommissioned any time now, and the James Webb Space Telescope at least in 2018 and unlikely to be active while Hubble still remains, will there be a gap when we have ...