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Physics

Aliens slumbering for billions of years are out there – really?

Trying to explain the Fermi paradox by invoking aliens that sleep for aeons is a speculative idea to be taken with a large pinch of salt, says Geraint Lewis

Comment

Mars rover wheel tracks

Life

The best way to detect aliens may be by finding their footprints

News

A possible view on an alien world: mountaintops poking through mist and two suns visible in the sky

Space

The exoplanet zoo – a whistle-stop tour

Features

surface of Mars

Life

The ethics issue: Should we colonise other planets?

Features

Marine zooplankton

Earth

Oil-exploration airguns punch 2-kilometre-wide holes in plankton

News

Very Large Array radio telescope

Space

Messages from fake aliens decoded quickly in online SETI contest

News

Mars strata

Life

Mars rover sees signs of microbe-friendly layers in ancient lake

News

A snail feasting on the excrement of a sea lily

Life

Sea stars filmed hunting squid and squabbling over eating it

News

meteorites landing on early Earth

Space

Microbes might thrive after crash-landing on board a meteorite

News

Odds on: 10 science breakthroughs you can bet on

Life

Odds on: 10 science breakthroughs you can bet on

Human clones, a colony on Mars, alien contact... what world-changing breakthroughs will come in the next decade? We asked the experts – with some surprising results

Features

Space

Martian life must be rare as free energy source remains untapped

News

Life

We still haven’t heard from aliens - here’s why we might never

News

Space

The five best exoplanets in the galaxy to check for alien life

News

Space

Cassini finds final ingredient for alien life in Enceladus’s sea

News