New ideas about planetary interiors from MESSENGER! Mercury's core is huge, with an iron sulfide outer core, a deeper liquid middle core and possibly a solid inner core.
Got five minutes? The YSS Team has identified questions for particular aspects of the website. You are invited to take any one -- or all -- of these surveys. If you do take more than one, there will be some repetitive information at the beginning - but we think this is better than one long survey!
There are plenty of ways to join in the Year of the Solar System: Add #nasayss to your space-related tweets, join the conversation at on the Our Solar System Facebook page and submit your YSS events to our calendar.
We have an intimate relationship with our sun. Its light and gravity profoundly affect our planet's motions, weather, oceans, and life, as well as all other objects in our solar system.
Join us this month as we explore ice and its properties, where it is located, and what it tells us about the planets and moons in our solar system. We will join the Earth Day celebrations this month! Check out the classroom and informal activities, resources, and further information.
Join us this month to observe a rare transit of Venus, just like the 1769 transit observed by Captain Cook, and learn more about how distant worlds are being discovered through the Kepler and other missions.
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