NASA's Mars 2020 Perseverance Rover - Why is Mars so interesting?
iasparliament
February 19, 2021
What is the issue?
NASA's Mars 2020 Perseverance Rover touched down on the Martian surface.
In this context, here is a look at Perseverance Rover’s plan and also why Mars remains so interesting for scientific experiments and exploration.
How had Mars Science been in the past?
1960s - From the time of the first generation missions in the 1960s, the world has come a very long way in understanding Mars.
The Viking missions in the mid-seventies carried out the first chemical analysis of Martian soil.
It also did four biology experiments to detect biological activity.
The experiments did not yield any conclusive evidence of life.
1980s - In the early 1980s, scientists hypothesised that certain meteorites might have a source region in Mars, in contrast to the asteroid belt.
This was based on mineralogic composition and rock texture.
In 1984, a study showed that the isotopic composition of rare gases (Xenon, Krypton, Neon and Argon) matched the isotopic ratios of the Martian atmosphere measured by the Viking spacecraft.
This discovery provided a way for geochemists to study Martian samples.
It provided a huge boost to the understanding of the geochemical evolution of Mars.
2000s - Mars was considered to be a dry planet in the 20th century.
This changed in 2001, when the Gamma Ray Spectrometer on board the Mars Odyssey spacecraft detected a fascinating hydrogen signature.
It seemed to indicate the presence of water ice.
But there was ambiguity, as hydrogen can be part of many other compounds as well, including organic compounds.
To test for the presence of water, NASA sent a spacecraft to land near the Martian South Pole in 2007.
The spacecraft studied the soil around the lander with its robotic arm.
It was able to establish, without any ambiguity, the presence of water on Mars for the first time.
The Curiosity rover carries an instrument called SAM (or Sample Analysis at Mars).
It contains a suite of spectrometers with the goal of detecting organic compounds on Mars.
SAM has a mass spectrometer that can measure not just the elements, but the isotopes as well.
This instrument has made the fascinating discovery of large chain organic compounds on Mars.
It is not known how these organics form on Mars.
The process would likely be inanimate.
But there is a possibility that such complex molecules were formed by processes associated with life.
Mars Insight is creating history right now, by monitoring seismic activity and heat flow on Mars.
This will help understand the composition of the Martian interior.
Why is Mars so interesting to scientists?
First, Mars is a planet where life may have evolved in the past.
Conditions on early Mars roughly around 4 billion years ago were very similar to that of Earth.
It had a thick atmosphere, which enabled the stability of water on the surface of Mars.
If indeed conditions on Mars were similar to those on Earth, there is a real possibility that microscopic life evolved on Mars.
Second, Mars is the only planet that humans can visit or inhabit in the long term.
Venus and Mercury have extreme temperatures – the average temperature is greater than 400 degree C.
All planets in the outer solar system starting with Jupiter are made of gas – not silicates or rocks – and are very cold.
Mars is comparatively hospitable in terms of temperature, with an approximate range between 20 degrees C at the Equator to minus 125 degrees C at the poles.
Why is Perseverance Rover significant?
Perseverance addresses both the critical themes around Mars:
the search for life
a human mission to Mars
It is not just another Rover Mission but the most advanced, most expensive and most sophisticated mobile laboratory sent to Mars.
The results of the experiments on Perseverance will likely define the next couple of decades of Mars exploration.
It will determine the course of search for life and a future manned mission to Mars.
What all will the Perseverance Rover accomplish?
Sample Return Mission - Perseverance is the first step in a multi-step project to bring samples back from Mars.
The study of the returned rock samples will hopefully provide a decisive answer on whether life existed on Mars in the past.
Here are the steps in the Sample Return:
Collect rock and soil samples in 43 cigar-sized tubes - samples will be collected, the canisters will be sealed, and left on the ground
Mars Fetch Rover (provided by the European Space Agency) - land, drive, and collect all samples from different locations, and return to the lander
The Fetch Rover will then transfer the canisters to the Ascent Vehicle.
The Mars Ascent Vehicle will meet with an Orbiter after which the Orbiter will carry the samples back to Earth.
This long-term project is called MSR or Mars Sample Return.
MSR will revolutionise our understanding of the evolutionary history of Mars.
If MSR is successfully executed, it will tell a reasonable answer of whether there was microscopic life on Mars.
But MSR does have its risks.
If one of the components fails, like the Fetch Rover or the Mars Ascent Vehicle, MSR is doomed.
A hidden risk is strategic. At the cost of MSR, there could be 5-10 spacecraft missions to different parts of the solar system.
Producing oxygen on Mars: A technology and infrastructure in place to manufacture oxygen on Mars using raw materials available on Mars, is crucial to make a human mission to Mars at reasonable cost.
Perseverance will have an instrument – MOXIE, or Mars Oxygen In-Situ Resource Utilisation Experiment.
This will use 300 watts of power to produce about 10 grams of oxygen using atmospheric carbon dioxide.
Should this experiment be successful, MOXIE can be scaled up by a factor of 100 to provide the two very critical needs of humans:
oxygen for breathing
rocket fuel for the trip back to Earth
Looking for underground water on Mars: Perseverance will carry the Radar Imager for Mars’ Subsurface Experiment (RIMFAX).
RIMFAX will provide high resolution mapping of the subsurface structure at the landing site.
The instrument will also look for subsurface water on Mars.
If found, it would greatly help the case for a human mission or the cause of a human settlement on Mars.
Testing a helicopter to fly on Mars: The Mars Helicopter is really a small drone.
It is a technology demonstration experiment, to test whether the helicopter can fly in the sparse atmosphere on Mars.
The low density of the Martian atmosphere makes the odds of actually flying a helicopter or an aircraft on Mars very low.
