Jupiter's moon IO has towering volcanic explosions
The Jovian moon has hundreds of volcanoes and is considered the most active moon in the solar system, sending plumes of sulphur up to 190 miles (300 kilometres) into its atmosphere.
Mars has a volcano that's bigger than the entire hawaii-
While Mars seems quiet now, gigantic volcanoes once dominated the surface of the planet. This includes Olympus Mons, the biggest volcano ever discovered in the solar system. It is triple the height of Mount Everest, the tallest mountain on Earth.
A 2020 study that thrilled some astrobiologists detected phosphine, a possible sign of decaying biological matter, high in the Venusian clouds. Could they be a sign of life? Not without sufficient water, claim follow-up studies that firmly reject the possibility of life in Venus' dry windy atmosphere.
Mercury is shrinking - Mercury is already the smallest planet in the solar system (excluding the dwarf planet Pluto, of course), and the second-densest after Earth. And it's only getting smaller and denser .
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