The Philae lander has touched down on Comet 67P/Churyumov-Gerasimenko, marking the first landing on a comet. The Philae was part of the Rosetta mission launched by the European Space Agency. Philae took about seven hours to cross from Rosetta to the comet before it touched down and launched harpoons into the comet’s head to anchor itself. Armed with ten instruments, Philae will help scientists learn more about comets.
The Herschel spacecraft, launched by the European Space Agency, has determined that water in the upper atmosphere of Saturn comes from the moon Enceladus, which orbits approximately 238,000 km from the planet. Enceladus spews water into space at a rate of 250kg/s. Scientists estimate that between 3-5% of that is captured by Saturn, which is enough to account for the levels of water found in Saturn’s atmosphere.