http://www.abc.net.au/rn/australiata...08/2430181.htm
You should be able to listen via Internet here:
http://www.abc.net.au/rn/
It's called Dark Energy and it makes up about 73 per cent of the universe but the scientific community isn't really sure what it is; is it matter, is it a vacuum, is it a constant?
If you're a science buff, a star gazer or just interested in new ideas, it's your chance to join the discussion with three of our leading astronomers. We'll look at Einstein's theories, glance back to the work of Edwin Hubble, and look forward to what the unravelling of the Dark Energy mystery might mean. Graham Phillips, from ABC TV's
Catalyst program will join Paul Barclay as co-host of the program.