Radio Astronomy: The End of Big Dishes?

Important note: This special presentation of SETI Talks will be held at a different time than usual (10AM PDT / 1PM EDT / 1700 UTC)
Big-single dish radio astronomy observatories such as the 305-m Arecibo Observatory and the 500-m FAST (Five-hundred-meter Aperture Spherical Telescope) have made key breakthroughs in science, including the discovery of the first extrasolar planets. Recently, interferometric telescopes such as MeerKAT in Australia, ASKAP (Australian Square Kilometre Array Pathfinder), and CHIME (Canadian Hydrogen Intensity Mapping Experiment) have opened up new observing windows. These experiments are all precursor to the SKA (Square Kilometer Array), whose construction will begin in 2021 and is expected to be the most sensitive radio telescope ever built.
Why this explosion of radio telescope projects?
What’s the scientific reasoning for building arrays separated across continents?
What challenges do astronomers and engineers face?
Finally, what kind of science are these arrays useful for and will SETI benefit from their capabilities?

[@rameyzamora1018]

The discussion actually starts at 6:40 or so.

[@ricko2001]

I wish there had been discussion on how images are formed from array and big dish radio telescopes.

[@alainremi267]

Thanks for your excellent YT. I'm watching from French West Indies 😁😁😁

[@Straithe]

Thanks for the video!

[@Jacky-jf7wn]

💙 seti institute ♡♡♡ so cool 😎 (East side of Cleveland OHIO)

[@vk6xcj]

Hi this is very interesting , my hobby is ham radio VK6XCJ is my call sign , was wondering what mode and frequency would be the best to listen on for say alien space craft communications or alien planets with radio waves etc ??

[@ricko2001]

Where are the big dish advocates?

[@zapfanzapfan]

I like big dishes and I cannot lie! :-)

[@wildcatherder]

They are simply not cost effective now that interferometry is possible up to optical wavelengths.

[@zapfanzapfan]

20 repeating SRB:s? Wow, I have not been keeping up! Maybe we can solve this mystery soon :-)

[@FaceFcuk]

neutron stars spinning

[@stevemumbling7720]

You can't do radar mapping of planets and asteroids with small dishes though can you?

[@schmetterling4477]

I doubt it. Apart from the need for very high transmit power (which a small antenna simply can't support), the signal to noise of the single receiver is limited by the dish size. Ideally we will be building very large space arrays that combine both, large antennas and very long baselines (potentially the size of the solar system).

[@nebuladus7850]

This Awesome Beautiful thxsomuch. 🔭🛸

[@williamcox2295]

Hello from Ireland

[@JohnDoe-tt6bh]

Yes, yes it is.

[@qzorn4440]

Seem like elon musk should fix things like the huge radio telescope that needs it. Instead of fixing things like Twitter that was not broken just a little bent. 😎 thanks smart people.