Hal Clement is a recognized classic of American science fiction of the 20th century, awarded the title of Grand Master by the Science Fiction Writers Association of America in 1998. But above all, this writer is a famous “creator of worlds.” A science fiction writer whose credo is to come up with a “completely incredible”, but at the same time completely logically constructed world. Invent its nature, its laws, its inhabitants. Invent - and set events in motion... This is the "Gravity Expedition" - a book that has been included in the "golden fund" of world science fiction for half a century and has remained a "golden classic" for domestic connoisseurs of the genre for three decades. Create worlds that are convincing down to the smallest detail details, many authors tried (and are trying), but only a few managed (and manage) to do it. Hal Clement - SUCCESSED. Don’t believe me? Read - and check for yourself! Contents: Expedition “Gravity” (translation by S. Berezhkov) At the critical point (translation by V. Golant)Fire cycle (translation by S. Berezhkov, S. Pobedin)Starlight (translation by S. Burenin)