What is the likelihood that we will ever find that there was or is life on Mars?

Question

Eric Burns · Accepted Answer

One of the grandest questions is whether or not we are alone in the universe.

The ingredients for life appear to be ubiquitous, but how often that ultimately leads to life is unknown. Mars is one of the likeliest places for life to have existed, being the closest planet which was once habitable, including liquid water in the distant past. Further, if life existed then, its possible it still exists on Mars under the surface. Observations with past and current scientific experiments have hinted that life has or does exist on Mars. If the US decides to proceed with the Mars Sample Return mission, which will gather dust and rocks from Mars and bring them back to Earth for detailed study, we could prove life on Mars as early as 2040.

I am one of a dozen or so scientists external to NASA brought in to consult on the design of the Habitable Worlds Observatory. This successor to Hubble is designed to seek signatures of life beyond our own, with a planned launch around 2040. Thus, NASA is seeking to answer the grand question "are we alone?" with every viable avenue.

What is the likelihood that we will ever find that there was or is life on Mars?

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