Patrick Moore investigates evidence for the existence of black holes - collapsed stars whose gravitational field is so strong that not even light can escape.
Earlier this month, the comet Shoemaker-Levy 9 impacted on Jupiter and was destroyed. Patrick Moore reports on the event with Drs Jim Scotti, Steven Miller and John Mason.
Australia has become a major centre for radio astronomy. The 210-foot dish at Parkes, New South Wales has been in continuous operation since 1961 and has provided work of fundamental importance. The "Australia Telescope", a network of all the main observatories, now covers a wide area of the continent. In this programme, Patrick Moore goes to the Australian radio observatories and talks to the scientists who have made Australia so important in this branch of astronomy.
