For many years, experiments showed that light had wave-like properties. for this reason, scientists described light as a
wave. more recently, experiments produced data that could not be explained by the wave theory of light. the idea of particle
properties was introduced.
why did the theory of light change over time?

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.