An excellent source for current science news http://www.newscientist.com/news.ns
National Aeronautic and Space Administration: NASA http://www.nasa.gov/
NASA's Jet Propulsion Lab website - excellent source of information about current and past space exploration. http://www.jpl.nasa.gov/index.cfm
National Oceanographic and Atmospheric Administration: NOAA - Great website for studying weather around the nation. Up to date local weather for anywhere in the country is also available. http://www.noaa.gov/
When you need reliable answers - go to the reference desk http://www.refdesk.com/
Wikipedia - a great place to start looking for information http://en.wikipedia.org/wiki/Main_Page