Perseverance image shows the Sun setting down on the Martian horizon glowing a strange, cool blueish green.

The image captured by the rover’s navigation camera, located high on the rover’s mast aiding in driving, was acquired by Nasa on Thursday, the American space agency noted.

The otherworldly nature of the sunset image also sheds light on the physics of light scattering on the Red Planet, and how it contrasts with a similar phenomenon on the Earth.

On July 4, 2023, the Perseverance Rover marked its 842nd day on Mars. As the red Martian sky grew dark, the robot on Marsturned its left navigation camera towards the hazy horizon and captured a unique sunset that differs from those seen on Earth.

Have a good look, because it’s nothing like a sunset you will see here on Earth, and there’s a good reason for that.

Mars is further from the Sun than Earth, which means light on this nearby planetary body is not nearly as powerful – at most, it receives less than half of the sunlight that we do.

When sunlight enters Earth’s atmosphere, it interacts with oxygen, nitrogen, and other particulates in the sky, scattering blue light far and wide.

Upon Mars, instead of sunlight interacting with oxygen or nitrogen, it interacts with iron-rich dust that hangs in the atmosphere. This ultimately scatters lower-frequency red light through the sky during the day.

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