... Saturn's Cloud Tops . ... Spiral Galaxy M90 . ... Also dubbed NGC 4569, this galaxy has a very compact and bright nucleus. ... This odd-looking structure silhouetted in the foreground houses the three largest solar telescopes in the world. ... A stunning map of this distant, diminutive planet, the first based on direct images, was revealed late last week in a Hubble Space Telescope press release. ... The Arecibo radio telescope is currently the largest single-dish telescope in the world. ...