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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

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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

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

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

Features

Martian surface

Space

Martian life must be rare as free energy source remains untapped

News

SETI

Life

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

The most ambitious SETI project yet found nothing in its first data release, and a new approach suggests we might never make contact even if alien life is common

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Space

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

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Space

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

News

Space

A little less ET, a little more astrophysics, if you please

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Space

TRAPPIST-1 worlds are close enough for life to hop between them

News