NASA Astronomy Picture of the Day 15 April 2023: Retrograde motion of Mars
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Among all the planets in the solar system, the one that has fascinated astronomers the most is Mars. Even before any space mission reached the Martian surface, many believed that the red planet could have had alien life on it. Today, the NASA Perseverance rover, the Curiosity rover, the Mars Reconnaissance Orbiter, and the Ingenuity helicopter explore the planet looking for signs of water and ancient life. And the NASA Astronomy Picture of the Day also focuses on the red planet and highlights its fascinating motion.Today's NASA Astronomy Picture of the Day is a composite picture that traces the retrograde motion of Mars. Interestingly, every two years, astronomers see the red planet make a Z shape in space as it passes through space. This is interesting because making a Z-shape r...