... What are five closely grouped galaxies doing in this image? The grouping is commonly known as Stephan's Quintet. ... Girdling the second largest planet in the Solar System, Saturn's Rings are one of the most spectacular sights for earthbound telescopes. ... Destination: Moon . ... The Red Spider Planetary Nebula . ... Earth's Richat Structure . ... Fractal Interstellar Dust Up Close . ... The Largest Rock Known . ... It is larger than every known asteroid, moon, and comet nucleus. ...