The night sky Anyone with a keen interest in astronomy may want to acquire their own telescope. There is a large range of good telescopes on sale in most countries, with Europe and North America being particularly well supplied. The amateur astronomer can use a great variety of instruments and techniques, and even build an […]

Cosmology has changed from a subject of philosophical and theo¬logical introspection into a branch of the physical sciences. There is now an established framework which delineates the arena of cosmic physics. It is not thought that future developments will change the basic picture, but will rather define the picture more precisely. Thus we expect to […]