The study of exoplanets has rarely left the news since their first discovery two decades ago  - and the headlines are unlikely to stop anytime soon.
Paolo Ferri concludes his unique and personal view of the ground-breaking ESA Rosetta mission based on his two decades-long association with the pioneering ESA space mission.
When scientists began to calculate how much helium-3 there is in the Universe they stumbled upon a problem. As a primordial nuclide, 3He was forged shortly after the Big Bang.
NASA plans to put humans on Mars in the near future but many obstacles lie ahead.
The United Nations Office for Outer Space Affairs (UNOOSA) is pursuing a remit to ensure all of humankind can benefit from the use of space.
There are many outstanding questions as to whether humans could survive as a species over multiple generations in another planetary environment.
Solar sailing is finally becoming a reality.