Notes
Time for the Stars, a Heinlein juvenile novel.

The image opposite and the blurb below are from the 1963 Victor Gollancz hardback edition. Cover illustration by Alan Breese.

Publisher’s Blurb – Front Jacket Flap
Earth has become over-crowded. Man has spread throughout the Solar System, but the planets have proved to be frozen or burning or airless—none really suited to homo sapiens. As the demand for living room grows, it becomes, ever more urgently, time for the stars.

The Long Range Foundation has decided to explore the universe in a dozen directions at once. Torchships, which can travel at almost the speed of light, have long since superseded rockets as the transport of outer space. But as travel has become faster, the problem of communication has become increasingly difficult: there’s not much point in sending a radio message from a torchship that is light years away, for the message will take years, if not decades, to arrive. And then the Foundation makes a sensational discovery that enables messages to be transmitted instantaneously, even over the vast distances of space. Tom and Pat Bartlett, identical twins, are signed up by the Foundation as a team. One stays at home. The other goes star-side. And there follows a splendidly exciting, stimulating and original science fiction adventure—a story, to quote one of the American reviews, that 'strengthens Heinlein’s niche in the science fiction field yet further'.