Sunsets on Mars are blue — the opposite of Earth
Some trivia is so bizarre it forces you to rethink your entire understanding of the world. Check out the fact below, see how others reacted, and scroll down to dive into the verified science and history behind it.
On Earth, sunsets are red and orange because our thick atmosphere scatters shorter blue wavelengths in all directions while longer red wavelengths travel straight to your eye at the horizon. Mars has the opposite atmospheric composition — fine iron-oxide dust scatters red light and allows blue light to pass through more directly at sunset. NASA's Curiosity rover has photographed Mars sunsets as strikingly blue. The same Martian sky that appears pinkish-red at midday turns blue at dusk.
The colour of a sunset is determined entirely by what is in the air, not by the star. The same Sun produces a blue sunset on Mars and a red one on Earth because of the difference in dust and atmosphere.
The Science Behind It
On Earth, sunsets are red and orange because our thick atmosphere scatters shorter blue wavelengths in all directions while longer red wavelengths travel straight to your eye at the horizon. Mars has the opposite atmospheric composition — fine iron-oxide dust scatters red light and allows blue light to pass through more directly at sunset. NASA's Curiosity rover has photographed Mars sunsets as strikingly blue. The same Martian sky that appears pinkish-red at midday turns blue at dusk.
Why Your Brain Finds This Hard to Believe
OddlyHuman Editorial
VerifiedWritten and fact-checked by the OddlyHuman Behavioral Science Team. We verify all psychological, sociological, and historical claims against peer-reviewed journals, primary sources, and established encyclopedias to bring you accurate insights.
Read our Editorial Guidelines →“Sunsets on Mars are blue. The same sun that makes our sunsets orange makes Martian sunsets blue because of red dust in the air.”