At present the most brilliant object in the evening sky is Jupiter, giant planet of the Solar System - an immense world with cloud belts, the fascinating Great Red Spot. and four bright moons. Even a small telescope will show details upon its yellowish gaseous surface. Patrick Moore talks about Jupiter, and the many problems that it presents to modern astronomers.

Well over a thousand artificial satellites are now in orbit round the earth, and some can be seen as bright lights crossing the stars. Patrick Moore talks to Desmond King-Hele, F.R.S. about the way amateur observers can sight and track satellites, and about the value of these observations to space research.

Patrick Moore and Dr. V. Barocas talk about the nebulae - clouds of gas of many kinds far out in space. In some of these, new stars are coming into existence.

Close-up photographs of prospective lunar landing-sites are rapidly increasing our knowledge of the moon's surface. But how strong is the evidence that the lunar craters were formed by the same kind of volcanic activity as Earth calderas? Patrick Moore puts this question to a geologist, Dr. G.J.H. McCall.

On the programme's tenth anniversary, Patrick Moore describes the enormous advances made in astronomical studies during the space-decade since April 1957. He shows highlights from past programmes, including the first photographs of the far side of the moon in 1959 and the solar eclipse tracked across Europe in 1961.

Since the American rocket Mariner IV went close to Mars to send back information, our ideas about the Red Planet have changed very much. Patrick Moore discusses these new ideas with Harold Ridley and in particular considers whether there can be any life on Mars.

Vega, one of the brightest stars in the sky, is now almost overhead during the evening. It is a magnificent blue star, much hotter than the sun. Patrick Moore and Dr. V. Barocas talk about Vega, and discuss the view of the universe that could be obtained from there.

From 1845 until 1917 the biggest telescope in the world was the 72-inch reflector built and operated by Lord Rosse at his Irish home. Patrick Moore visits Birr Castle in County Offaly, Eire, to discuss with the present Lord Rosse his great - grandfather's remarkable achievement in constructing the huge telescope, and his use of it to establish the spiral nature of galaxies.

Patrick Moore talks about Novae, which appear to be new stars but are in fact existing ones brightened by explosions, and discusses the new Nova near the Constellation of Delphinus with George Alcock, a Huntingdonshire schoolmaster, who was the first person to see it.

Patrick Moore and Colin Ronan discuss the increasing study of non-visible radiations from space which is dramatically widening our knowledge of the universe.

In the just-completed NASA Lunar Orbiter programme, five photo-laboratories have orbited the moon at 4,500 m.p.h. Patrick Moore talks to H. J. P. Arnold about the sophisticated techniques involved in spacecraft photography.

The Russian probe Venus 4 has landed on its target. Patrick Moore talks about the mysterious earth's twin' planet, and puts questions about the new information from Venus to Colonel Valery Bykovsky, the Russian astronaut. Close Down

Meteorites are the only solid objects from outer space which land on earth. Two thousand have been found, the biggest weighing sixty tons. What are they, and where do they come from? Patrick Moore discusses their significance and possible origin with a geologist, Dr. G. J. H. McCall.