Question

this planet’s thin atmosphere has led astronomers to believe that the surface water that once existed might have taken liquid form.

Answer 1

The planet with a thin atmosphere that has led astronomers to believe that the surface water that once existed might have taken liquid form is Mars.

This is based on the scientific evidence gotten through the Images from orbiting spacecraft.

This scientific image shows the ancient channels that resemble a similar dried-up river bed on Earth.

Over the years, Mars has been speculated by scientists to be the planet that can sustain life. As a result, there have been constant checks on the planet.

Hence, in this case, it is concluded that the correct answer is Mars.

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