<p>I’m wondering about the abilities of a technology: You may have heard of the Square Kilometer Array. The array is focused by adjusting the timing of the individual antennas.
Q: Could this array be focused toward or through the Earth? Would it allow us to image structures on or in our planet?</p>
<p>Q2 Follow-up question: If such an array was “placed” at/near L1, could it locate satellites? a flying plane? A landed plane? Ships? Underwater? The planet’s core? I’m asking specifically, because I think astronomers could get the best telescope they could imagine, and it would be funded by mostly non-astronomers and without government support.</p>
<p>Follow-up to Q1: Assuming the cost of a telescope element fixture finds itself accessible to the hobbyist astronomer, could each ground-based astronomer be networked into a global array?</p>
<p>I imagine it would take seconds to send a timing pulse to zero-out the detectors and time-shift the detector appropriately to orient the array in the desired direction. Record a few seconds of signal and send it to anybody who wants a copy for further analysis. A few larger organizations retain copies for longitudinal studies, and historical record.</p>
<p>The software updates the array to align it for its next assignment: timing pulse, spectrum, and direction. Wait 3-10 seconds. Next. Time on this array would be plentiful. The cost of operating it, negligible.</p>
<p>Thanks for reading. When I heard about this tech my mind went crazy with the potential and the possibilities!</p>
<p>Thank you.</p>

CC BY-SA 4.0
2023-10-30T11:06:48.473Z
You might want to look at the Russian Spektr-R project from the last decade. That's pretty much the the largest baseline ever achieved in radio astronomy, however the project was plagued by other, massive difficulties.
https://en.wikipedia.org/wiki/Spektr-R
AtmosphericPrisonEscape
CC BY-SA 4.0
2023-10-31T05:31:45.303Z
this may also be useful https://en.wikipedia.org/wiki/Very_Long_Baseline_Array
ayr
CC BY-SA 4.0
2023-11-03T05:15:13.177Z
The way Q1 has been framed I get the impression you have a misconception about how radio telescopes function. Most radio telescopes are just radio receivers. Not every telescope has radio emitting functionality. To see through the Earth & to see structures on in the Earth one needs to transmit a signal into the Earth & then measure the Earth's response. This could be achieved by radar or by having a radio transmitter on the opposite side of the Earth to the radio receiver. Additionally, for this to work, the appropriate radio frequencies would need to be used.
Fred
CC BY-SA 4.0
2023-11-04T14:16:17.570Z
Thank you for your thoughtful responses! 
I guess I assumed a radio telescope could “see” through the planet, how they see through interstellar dust clouds and such. I know *some* frequencies pass right through the earth. I assumed the shading one would observe as that light passed though could indicate underground structures and regions. 

Ultimately I hope to see a multi-spectrum telescope array anyone may use. Given current technology I think it’s a matter of time. 

“The only difference between the impossible and the mundane, is the date.” — me
Joe D
<observational-astronomy><amateur-observing><radio-astronomy><space-telescope><identify-this-object>
Space-based radio telescope array
Joe D
# Space-based radio telescope array

(Asked by: username_0 on 2023-10-29)

I’m wondering about the abilities of a technology: You may have heard of the Square Kilometer Array. The array is focused by adjusting the timing of the individual antennas.
Q: Could this array be focused toward or through the Earth? Would it allow us to image structures on or in our planet?

Q2 Follow-up question: If such an array was “placed” at/near L1, could it locate satellites? a flying plane? A landed plane? Ships? Underwater? The planet’s core? I’m asking specifically, because I think astronomers could get the best telescope they could imagine, and it would be funded by mostly non-astronomers and without government support.

Follow-up to Q1: Assuming the cost of a telescope element fixture finds itself accessible to the hobbyist astronomer, could each ground-based astronomer be networked into a global array?

I imagine it would take seconds to send a timing pulse to zero-out the detectors and time-shift the detector appropriately to orient the array in the desired direction. Record a few seconds of signal and send it to anybody who wants a copy for further analysis. A few larger organizations retain copies for longitudinal studies, and historical record.

The software updates the array to align it for its next assignment: timing pulse, spectrum, and direction. Wait 3-10 seconds. Next. Time on this array would be plentiful. The cost of operating it, negligible.

Thanks for reading. When I heard about this tech my mind went crazy with the potential and the possibilities!

Thank you.

**Tags:** observational-astronomy, amateur-observing, radio-astronomy, space-telescope, identify-this-object
> **Comments:**
> **username_1**: You might want to look at the Russian Spektr-R project from the last decade. That's pretty much the the largest baseline ever achieved in radio astronomy, however the project was plagued by other, massive difficulties. https://en.wikipedia.org/wiki/Spektr-R  
> **username_2**: this may also be useful https://en.wikipedia.org/wiki/Very_Long_Baseline_Array  
> **username_3**: The way Q1 has been framed I get the impression you have a misconception about how radio telescopes function. Most radio telescopes are just radio receivers. Not every telescope has radio emitting functionality. To see through the Earth & to see structures on in the Earth one needs to transmit a signal into the Earth & then measure the Earth's response. This could be achieved by radar or by having a radio transmitter on the opposite side of the Earth to the radio receiver. Additionally, for this to work, the appropriate radio frequencies would need to be used.  
> **username_0**: Thank you for your thoughtful responses!  I guess I assumed a radio telescope could “see” through the planet, how they see through interstellar dust clouds and such. I know *some* frequencies pass right through the earth. I assumed the shading one would observe as that light passed though could indicate underground structures and regions.   Ultimately I hope to see a multi-spectrum telescope array anyone may use. Given current technology I think it’s a matter of time.   “The only difference between the impossible and the mundane, is the date.” — me  

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