... In fact, from its vantage point 150 million kilometers sunward of planet Earth, SOHO's cameras can always monitor the Sun's outer atmosphere, or corona. ... Green and Black Auroras Over Norway . ... These unusual gaps can make Research using data from four Cluster spacecraft orbiting the Earth has likely found the secret: auroral gaps, sometimes knows as black auroras, are actually anti-auroras. ... Animation of Asteroids Passing Near Earth . ... Moonquakes Surprisingly Common . ...