Comment Re:Question (Score 1) 126
Are these mega-scopes just PR exercises or are they necessary instruments?
It's just a proposal at this stage, which is coincidentally generating a bit of PR by getting people reading and talking about NASA. As to "necessary," well, none of it's necessary, but the thought of getting 1000x Hubble resolution has got to be at least worth costing up.
I thought radio astronomy surpassed narrow-band subjective Galilean astronomy decades ago.
They're complimentary. You might be able to see "more" in most objective terms from the ground in radio than visible light, but that doesn't mean visible light can't provide information you can't get from radio.