The search for life on other planets has captivated humanity for decades.
But the reality may be a bit less like Hollywood blockbusters, the scientists reveal.
They said that if there was life on the red planet, it would likely present itself as fossilized bacteria – and have proposed a new way to find it.
Here are the most promising signs of life to date –
When searching for life on Mars, experts agree that water is the key.
Although the planet is now rocky and barren with water locked in polar ice caps, there may have been water in the past.
In 2000, scientists discovered the first evidence of water on Mars for the first time.
Nasa̵7;s global Mars surveyor found gulls could be produced by running water.
Debate is ongoing over whether these repeating ramps (RSL) can be formed from the water flow.
Earth has been dropped by 34 meteors from Mars, three of which are believed to be capable of carrying evidence of past life on the planet, writes Space.com.
In 1996, experts found an Antarctic meteorite called ALH 84001 containing fossilized bacterial-like formations.
However, in 2012, experts concluded that this organic matter was formed by volcanic activity without the involvement of life.
Signs of life
The first close-up images of the planet were taken by mission Mariner 4 in 1964.
These early images show that Mars has a topography that could be formed when the climate is much wetter and therefore inhabited by life.
In 1975, the first Viking orbiter was launched and although to no avail, it paved the way for other landing craft.
Many gliders, orbiters and landers have now revealed evidence of water underneath the crust and even occasional rain.
Earlier this year, Nasa’s exploration company Curiosity found potential building blocks of life in the lake of ancient Mars.
Organic molecules preserved in the 3.5 billion-year-old rock of Gale Crater – believed to have once contained a shallow lake the size of Florida’s Okeechobee Lake – suggesting that conditions could be beneficial at the time. for life.
Future missions to Mars plan to return the samples to Earth to test them more thoroughly.
In 2018, Curiosity also confirmed a sharp seasonal increase in methane in the Martian atmosphere.
The methane observations provide ‘one of the most fascinating scenarios’ to life today, experts say.
Curiosity’s methane measurements took place over the Earth’s 4-and-a-half years, including parts of the 3 Martian years.
Seasonal peaks are detected in late summer in the northern hemisphere and late winter in the southern hemisphere.
The magnitude of these seasonal peaks – in a factor of three – was more than scientists expected.