Spacefarers may contaminate other worlds – but scientists have plans to keep the cosmos clean

In his inauguration speech in January, United States President Donald Trump declared the US would “plant the stars and stripes on the planet Mars”. This shouldn’t come as a surprise. In 2017, in Trump’s previous term of office, he promised to “establish a foundation...

A new generation of telescopes will probe the ‘unknown unknowns’ that could transform our knowledge of the universe

In recent decades, we’ve learnt huge amounts about the universe and its history. The rapidly developing technology of telescopes – both on Earth and in space – has been a key part of this process, and those that are due to start operating over the next two decades...