Is it possible to consult renowned physicists online?

Michael Kaku’s website has a Contact link, but it appears to be for media people only.

Stephen Hawking discourages contact from the general public.

I’ve done a little looking around, and can’t seem to find any recent papers by either which list their address (usually the “corresponding author” will publish their email on the title page), So, it might just be that both have withdrawn their contact information because simply too many non-scientists are trying to reach them. I find this disappointing, because one of my own science heroes, Richard Feynman, would field letters from civilians all the time. Some of these letters were collected here.

There is no way to guarantee they will answer, but you can email Michio Kaku at: kaku [ AT ] sci [ DOT ] ccny [ DOT ] cuny [ DOT ] edu. His web site is http://mkaku.org/. It also has a contact button.

Stephen Hawking’s email address is: S.W.Hawking at damtp.cam.ac.uk.

You might have better luck getting God on the line.

Neil deGrasse Tyson seems to interact with the public quite a bit (I follow him on Facebook, and he’s hilarious, too.) Here is his contact info.

http://imagine.gsfc.nasa.gov/docs/ask_astro/ask_an_astronomer.html

@Rarebear Has a great link. You also might want to try Phil Plait of Bad Astronomy. I’ve heard him on podcasts and he is genuinely brilliant, accessible, and engaging.