The question of life on Mars has been circling the minds of the NASA researchers and experts for a relatively long time. Till now, there has been no definitive evidence that neither suggests nor supports such a claim.
The United States and other nations have been sending robotic spacecraft since the 1960’s and have transmitted thousands of images and additional valuable information back to our planet. No human expedition has been launched till now to reach planet Mars, although efforts are being made to make this a reality and could happen in a matter of few years.
Mars is the only other planet in the entire solar system that can relate or share similarity to Earth. In 1976, NASA had deployed two robotic spacecraft, Viking 1 and Viking 2 to Mars for many years. They were sent and controlled by NASA back home to check for the existence of life forms on the surface of the planet, specifical presence of bacteria in the soil which unfortunately could not be found.
The robots did, however, transmit various valuable information including pictures and data of various seasonal changes of the rocks and dirt found on the surface. Future expeditions will involve scrapping and digging for water found beyond the first layer of coating to check for definite information about life forms.
Compared to Earth, Mars is relatively smaller but theoretically big enough to support the existence of life forms. Earth’s life forms are water-based. So finding even the slightest trace of water on the Red Planet is a definite proof that there exists life form or can support the existence of life on the planet.
The future and the next few rovers to land on the planet will focus on seeking traces of water and looking for other once existed life forms that could have roamed the earth. Hints and presence of fossils could exist which could only be confirmed through extensive digging and observation of the surface.
Mars would be quite challenging to live as there are no magnetic fields, making it prone to surface space radiation damage, the presence of less air and even if water existed in the planet, it would not be liquid form but in the state of solid ice.
So future space expeditions would involve sending more advanced robotic rovers with enhanced capabilities and eventually support a human journey to the planet after redressing the needed errors to bring back samples of the planet along with the astronauts to be tested in laboratories located in NASA.