What's Hot This Week Neptune Finally Makes First Orbit Around the Sun Since Discovery In 1846 By Geoff Gaherty The planet Neptune will be in opposition - when the sun, Earth, and a planet fall in a straight line on Aug. 20. The planet will be exactly opposite the sun in the sky, being highest in the sky at local midnight. Usually this is also the point where the planet is closest to the Earth.     Wanted: A Solar Space Robot That Roves By Night By Zoë Macintosh NASA is getting serious about its latest challenge to space-minded engineers: Design a solar-powered night rover for exploring other worlds.     Sponsored by: Success In Orbit: Astronauts Replace Vital Space Station Cooling Pump Massive Mega-Star Challenges Black Hole Theories Cassini Spacecraft Photographs Three Saturn Moons 'Star Wars' Fans Feel the Need for Real Hyperspeed Dancing Rover: NASA's Moon & Mars ATHLETE Busts A Move

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