Of time and tides and Mercury The smallest planet in our solar system is also the fastest and closest to our sun. In fact, on occasion, the sun will reverse direction in Mercury’s skies. Join us for a look at this good thing in a small package. Here’s a video about Mercury. Mercury 101 Here’s a NASA page about Mercury. Overview | Mercury Here’s somebody else’s page on Mercury. Mercury, world of extremes Here’s NASA’s sight on the Mariner 10. In Depth | Mariner 10 Here’s NASA’s sight on the Messenger. MESSENGER Here’s a bit about how we learned of Mercury’s unusually large inner core. Mercury’s Spin and Gravity Reveals the Planet’s Inner Core And here’s a little something on Mercury’s spin orbital resonance. Mercury’s Spin-Orbit Resonance