Listen up, conspiracy theorists – it is virtually impossible that there could be alien visitors on Earth.
Methane detected at Mars’ Gale Crater (the centre picture).
For the first time, an instrument orbiting Mars and a rover on the surface have detected methane simultaneously – raising hopes for finding life on the red planet.
Mars seen by the Viking orbiter.
There's enough dissolved oxygen in the salty lake below Mars' surface to support simple lifeforms such as sponges. Here's what that means for space exploration.
Mars seen by Viking.
NASA / USGS
If we find microbes on Mars, it will be difficult to exclude the possibility that we have accidentally brought them there from Earth.
False colour mosaic made from infrared data collected by the Cassini spacecraft.
NASA / JPL-Caltech / Space Science Institute
Scientists discover rare molecules on Titan which suggests it's creating the building blocks of life.
The ALMA telescope is searching.
Astronomers in Puerto Rico have picked up signal from a faint star that's not like anything they've seen before.
Artist’s concept of the Mars Science Laboratory spacecraft approaching Mars.
Musk dismisses one of the main technical challenges of being on the Martian surface: the temperature.
Should we make contact with alien life?
We continue to search for intelligent life elsewhere in the universe. But if we find ET there are those who question whether we should make contact or not.
Mysterious radiation that appears to come from star HD 164595 is more likely to have a terrestrial origin.
Alpha Centauri is actually the outer star (bottom right) of The Pointers, which point to the Southern Cross.
Y. Beletsky (LCO)/ESO
A US$100-million plan has been announced to send tiny probes out in space in search of life elsewhere in the universe. But are they looking in the right place?
Artist’s impressiong of the Square Kilometre Array, which will revolutionise our ability to detect fast radio bursts.
SKA Project Development Office and Swinburne Astronomy Productions - Swinburne Astronomy Productions for SKA Project Development Office
A technological revolution in astronomical observations could be the key to understanding the perplexing phenonenon known as 'fast radio bursts' from outer space.
Elliptical galaxy SDSS J162702.56+432833.9 could be full of life.
A new model suggests that elliptical galaxies are more likely to be habitable than spiral galaxies like our own. Does that mean we're a freak event and elsewhere is teeming with life?
Green Bank telescope is one of the observatories that will eavesdrop on aliens.
The $100m project to search for aliens will help save observatories from closure and could lead to new astrophysical discoveries.
Looking for evidence of extraterrestrial intelligent life elsewhere in the universe.
Flickr/Asbjorn Sorensen Poulsen
Astronomers have been looking for signs of intelligent life elsewhere in the universe for centuries. But the search has so far found nothing. So what makes this latest hunt so different?
Artist’s impression of the Square Kilometre Array at night.
Telescopes have come a long way since the days when they were all about lone astronomers watching the night sky through their upstairs windows. Today teams of astrophysicists build and use much more modern…