When you look at the planet in the sky, it looks like a simple point of light
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When you look at the planet in the sky, it looks like a simple point of light
But when you experience Mercury close up, you perceive a complex system and not just a ball of rock and metal. We are all surprised by how active that planet is.
They tell us how important the cooling core has been to the evolution of the surface
Everything we've seen so far would suggest that the activity on the surface dates from the first half of solar system history rather than the last half
It's like we did a forensic analysis of Mercury ... This flyby got the first-ever look at surface composition. The Mercury magnetosphere is full of many ionic species, both atomic and molecular, and in a variety of charge states. What is in some sense a Mercury plasma nebula is far richer in complexity and makeup than the Io plasma torus in the Jupiter system.
And the data from the flyby indicate that the total contraction is at least one-third greater than we previously thought.
That's a lot of lava ... It shows the planet was really active in its early history.