The image depicts two stages of a lunar eclipse, a celestial event where the Earth passes between the sun and the moon, casting a shadow on the lunar surface. The left image shows the moon in a darker phase, with the Earth's shadow covering a significant portion of its surface. The right image displays a later stage, where the moon is more illuminated, indicating the Earth's shadow is receding. Lunar eclipses are significant astronomical events that offer insights into the Earth-moon-sun alignment and the Earth's atmospheric conditions.