1. Long before the Voyager flybys, Earth-based astronomers reported that Io appeared brighter than usual for a few hours after emerging from Jupiter’s shadow. Explain this brief brightening of Io. 2....

1. Long before the Voyager flybys, Earth-based astronomers reported that Io appeared brighter than usual for a few hours after emerging from Jupiter’s shadow. Explain this brief brightening of Io.

2. Compare and contrast Valhalla on Callisto with Caloris Basin on Mercury.