NASA's rover captures one 'dust devil' swallowing another on Mars
NASA's Perseverance Mars rover captured a Martian "dust devil" swallowing a smaller one. Dust devils are swirling columns of air and dust. The captured dust devil was about 210 feet wide while smaller one was 16 feet wide. Dust devils indicate atmospheric conditions like prevailing wind directions and speed and are responsible for about half the dust in Mars' atmosphere.