Ответ:
- искусственный: In 1957, the first artificial satellite Sputnik-1 was sent into space.
- исследовать: Russia continues to explore space and work together with other countries on international space exploration.
- исследователь: This text doesn't mention the word 'исследователь'.
- исследование: Russians are very proud of their history of space exploration.
- на орбите: It was in orbit for three months.
- национальный герой: He immediately became the most famous astronaut in the world and a national hero.
- перегрев: Unfortunately, the dog died during the flight from stress and overheating.
- в целости и сохранности: This text doesn't mention the phrase 'в целости и сохранности'.
- спутник: In 1957, the first artificial satellite Sputnik-1 was sent into space.
