The motion of Earth in space, Newtonian mechanics, spaceflight and spacecraft, and a math refresher, on a high school level. This site deals with the world of gravity--of massive planets and stars, and the way spaceflight is achieved despite their strong pull.
Looks at the hot gases which fill most of space which are ruled by magnetic and electric forces rather than by gravity. The polar aurora, the radiation belts, the solar wind, magnetic storms, "space weather", cosmic radiation--this is the site which tells you all about them.
The Old Farmer's Almanac offers the dates and locations of solar and lunar eclipses for the year, as well as the full Moon names and dates for nine years. Check it out here, then go outside and look UP!