Mysteries of Io NASA Hasn't Solved Yet

TL;DR

Io remains mysterious because its widespread volcanism, sulfur-rich crust, and possible global magma ocean are still poorly understood. NASA’s Juno spacecraft supplied better images of previously unseen areas, while volcanologist Dr. Ashley Davies explains how lava exceeding 1,400 kelvin interacts with frozen sulfur and sulfur dioxide across the moon. Read on to explore Io’s eruptions, Earth analogs, and the proposed Io Volcano Observer mission.

Transcript

I'm really fascinated by IO when you think about all of the Jovian moons they're all kind of similar icy moons with some kind of water ocean that's fine but IO just lays it all bare it is just like volcanoes across the entire world blasting into space it looks like it's just covered in Sulfur it's an amazing place and it is just poorly understood n... Read More

Key Insights

• 😌 IO's distinctiveness lies in its intense volcanic activity and sulfur-covered surface, offering a unique laboratory for studying planetary processes.
• 🌋 The proposed IO Volcano Observer Mission aims to explore IO comprehensively, studying its volcanoes, composition, and interior structure.
• 🌍 IO's volcanic activity, driven by tidal forces from Jupiter, provides insights into similar processes on other celestial bodies, including potentially habitable worlds like Europa and Enceladus.
• 🥮 Future missions could involve exploring lava tubes on IO and investigating the possibility of life-supporting environments on other moons with subsurface oceans.

Questions & Answers

Q: What mysteries about Io has NASA not solved yet?

Scientists still do not fully understand the extent and connections of Io’s active volcanism or whether a global magma ocean links its hotspots. Io’s sulfur-rich upper crust and the ways lava mobilizes sulfur and sulfur dioxide also remain important areas of study.

Q: What would someone see while standing on the surface of Io?

The surface would appear as a vast expanse of sulfur and sulfur dioxide frost beneath Jupiter in the sky. A fortunate observer might also see silicate lava fountains and huge volcanic plumes extending hundreds of kilometers into space.

Q: Is Io’s surface covered with water ice?

No; the ice-like material described on Io is frozen sulfur and frozen sulfur dioxide, not water. These volcanic materials have accumulated in thick layers over geological time and cover nearly all of the surface.

Q: How much of Io’s surface is covered by erupted lava?

Lava erupted from Io’s volcanoes covers only about 2% or 3% of the moon’s surface. Most of the remaining surface is rich in sulfur and sulfur dioxide, including sulfur dioxide frozen as frost.

Q: Why is Iceland considered an Earth analog for Io?

Iceland combines volcanic fire with ice and snow, allowing lava to erupt through or flow over frozen material. A comparable process occurs on Io when lava flows mobilize surface ices and help produce volcanic plumes.

Q: Have sulfur eruptions like those on Io occurred on Earth?

Yes; secondary sulfur deposits can be mobilized and erupted onto Earth’s surface. In Hawaii in 1950, nearby high-temperature silicate lava mobilized a crustal deposit, producing an eruption of almost 100% pure sulfur.

Q: How hot is the lava erupting on Io?

The basaltic or possibly ultramafic lava is described as having temperatures exceeding 1,400 kelvin. As it travels across the surface, it melts, mobilizes, and drives away sulfur dioxide.

Q: What is the proposed Io Volcano Observer mission?

The Io Volcano Observer was a proposed mission supported by Dr. Ashley Davies to investigate Io and its volcanic activity. NASA previously selected two Venus spacecraft instead, but the Io mission was still being proposed and making its way through the system at the time discussed.

Summary & Key Takeaways

• IO is a Jovian moon characterized by its sulfur-covered surface and intense volcanic activity, making it distinct from other Jovian moons.

• NASA's Juno spacecraft recently provided better images of IO, revealing numerous hotspots and active volcanism, fueling speculations about a global magma ocean.

• Dr. Ashley Davis discusses the proposed IO Volcano Observer Mission and its potential discoveries, as well as the importance of understanding IO for studying exoplanets.