... The beautiful Trifid Nebula (aka M20), a photogenic study in cosmic contrasts, lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. ... Particle Sizes in Saturns Rings . ... To help find out, the robot Cassini spacecraft now orbiting Saturn broadcast radio waves of three different wavelengths right through the rings to Earth earlier this month. ... What causes small waves in Saturn's rings? ... Such waves were first noticed last July and are shown above in clear detail...