A unionist contributor (Letters, 26 December) who conducted a relentless vendetta aimed at Alex Salmond complains about “vilification” from SNP supporters and appeals for tolerance. Then Roger ...

In his letter (Letters, January 10) Douglas Vakoch, president of METI International, the body dedicated to “messaging extraterrestrial intelligence”, questions John Thornhill’s concerns about aliens ...

The term alien or non-native species should be applied to species that have been moved around the world by people and released – deliberately or accidentally – into areas outside their natural range.

In your Editor’s Pick letter titled “Why esoteric science could be overlooked by aliens”, the writer thinks that spacefaring aliens might not know about relativity and quantum mechanics because it is ...