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Questions about observations performed in the radio frequency range of the electromagnetic spectrum.

5 votes

Radio telescope targeting

Large radio telescope have pretty good pointing accuracy: the individual dishes of the VLA are accurate to about 10 arcsec. the giant Lovell telescope at Jodrell Bank has a similar accuracy. The sec …
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12 votes

Why does the Event Horizon Telescope (EHT) not include telescopes from Africa, Asia or Austr...

Would it increase the diameter if they would include some from there? No. Not by much, at least. The telescopes are already ~20,000 km apart, so you can't create a longer baseline that still has …
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3 votes
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What is the farthest we can see into the universe?

It depends. In some areas, far-away stuff is obscured by obstacles in the foreground. In other places, we can see almost all the way to the earliest (and furthest-away) galaxies, like in the Hubble De …
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