Which two sentences best explain the central ideas of the passage?

Mars is more likely to have life than other planets because of the increased radiation it .

Research suggests that Mars has some features that would support life, but most conditions are too harsh for it.

Researchers will seek out water sources in their search for signs of life on Mars. There has probably never been life on Mars, but it may develop in the future. The lack of quality telescopes has prevented researchers from gaining information about the existence of life on Mars.