Much ado about Pluto
image credit: NASA, ESA, H. Weaver (JHU/APL), A. Stern (SwRI), and the HST Pluto Companion Search Team
Although now reclassified as a dwarf planet, Pluto is the center of a small world of its own. In addition to its large moon Charon, two more, shown above, were spotted by the Hubble Space Telescope in 2005. Check out these additional Hubble images to see the moons' positions at different times. Incidentally, Charon is so large that Pluto and Charon are sometimes referred to as a "double planet." To read about the NASA probe that will reach Pluto and Charon in 2015, see New Horizons.
For more on the controversy over Pluto's status, see NASA's Much Ado About Pluto and also Caltech astronomer Mike Brown's commentary. For the story of Pluto's discovery, see the Planetary Society's Pluto: The Discovery of a Planet.
Secrets of Ice
Visit Secrets of Ice, from Boston's Museum of Science, to learn about global change research in Antarctica. The scientific activity is presented with text and photos. Profiles of team members and daily logs provide interesting background information. To learn about the melting of the Antarctic ice cap, see Grace Under Fire from the American Physical Society's outreach website Physics Central.