Scientists say rogue comet 2I/Borisov is ‘most pristine’ ever
The object observed in 2019 is almost intact despite its long journey from another solar system and could be 4.5 billion years old
Yuri Gagarin’s troubled re-entry into Earth
A new book brings a fresh focus on the first astronaut to travel in space and links the stories of the race between the Soviet Union and the USA to reach the Moon first