Markers on Mars

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Across
  1. 1. Strange or unbelievable.
  2. 4. Efforts to explore and gather data about Mars.
  3. 5. A robotic vehicle used for exploring the surface of Mars.
  4. 6. signs Clear indicators or evidence of previous life.
  5. 8. Describing an environment that is suitable for supporting life.
Down
  1. 1. Made difficult to see or detect; hidden from view.
  2. 2. The process of one substance taking in another.
  3. 3. Physical or chemical indicators of past or present life.
  4. 4. Relating to the planet Mars or its hypothetical inhabitants.
  5. 7. Evidence or signs left behind by something that once existed.