Linked Questions

8 votes
7 answers
1k views

Could mirrors be replaced with CCDs?

Why do telescopes use mirrors that simply reflect photons, when they instead could be covered with large sensors to register them? Reflection is all good and well, all thanks to silver and beryllium ...
LocalFluff's user avatar
  • 11.4k
7 votes
3 answers
2k views

How would a Fast Fourier Transform Telescope work without a mirror, dish or lenses?

I recently came across a short article mentioning the idea for a telescope built without mirrors or lenses that instead uses an array of antennas and massive computing power to resolve an image. Such ...
SurpriseDog's user avatar
11 votes
1 answer
610 views

Was GRAVITY built to look at one star?

GRAVITY (shown below) is a interferometric combiner of near infrared light from four very large telescopes called The Very Large Telescope in order to make careful astrometric measurements near the ...
uhoh's user avatar
  • 30.7k
4 votes
2 answers
1k views

How is the field of view of a radio telescope determined?

It’s my understanding that radio telescopes can only receive signals that hit the dish within a certain range of angles. How is that angular range determined i.e. measured and/or calculated?
PerplexedDimension's user avatar
5 votes
2 answers
753 views

How does the Event Horizon Telescope implement the interferometry?

The BBC article Event Horizon Telescope ready to image black hole describes the Event Horizon Telescope, a coordinated observing technique with several radio telescope arrays across the globe forming ...
uhoh's user avatar
  • 30.7k
3 votes
1 answer
1k views

Which techniques are used to convert radio signals received by antenna to images?

I realized that after answering the question How do astronomers convert radio signals received by their antenna to images? I had missed the point that the OP was only asking about software. I've ...
uhoh's user avatar
  • 30.7k
1 vote
1 answer
302 views

Can the interferometer called "Gravity" measure "a few centimeters on the Moon"?

Phys.org's Very Large Telescope sees star dance around supermassive black hole, proves Einstein right links to several ESO videos, including Interview with Reinhard Genzel (in English). After ...
uhoh's user avatar
  • 30.7k
4 votes
1 answer
242 views

Will the lunar gateway be visible for ground based (amateur) telescopes?

Due to its low apparent magnitude and large apparent diameter, astrophotographers have managed to capture the ISS not only during solar and moon transits, but even come so far as to image individual ...
2080's user avatar
  • 1,890
6 votes
1 answer
290 views

How does ALMA produce stable, mutually coherent ~THz local oscillators for all of their dishes?

The ALMA (Atacama Large Millimetre/submillimetre Array) radio telescope's band-10 capabaility is now operational, per this answer. That's confirmed by NRAO's First Science with ALMA’s Highest-...
uhoh's user avatar
  • 30.7k
3 votes
2 answers
194 views

Would "layered" radio interferometry work?

tl;dr - Is splitting up the process of interferometry as shown in the diagram possible, and if so, is it more efficient and/or easier than traditional methods? I have been doing some research into ...
sforsingh's user avatar
  • 1,443
2 votes
1 answer
70 views

Is the delay to correlate the signal from one dish to another on a VLA radio telescope longer for red shifted objects?

When observing 2 objects side by side close to the horizon with a very large array, one receding fast & red shifted, is the delay to correlate the signal from the closest dishes to the further ...
Peter R. McMahon's user avatar
2 votes
1 answer
81 views

Do we have the technology to create a satellite telescope constellation that uses interferometry?

Apologies for putting the bulk of the question in the description. I'm honestly not sure how to ask this properly. The idea for this question came from a Vsauce video from several year ago I can't ...
Gryphon's user avatar
  • 23