Picture of the Day

1. Mercury and the Quiet Sun

   Mercury and the Quiet Sun

   
   

2. Mercury in Silhouette

   Mercury in Silhouette

   
   

3. NGC 3717: A Nearly Sideways Spiral Galaxy

   Some spiral galaxies are seen nearly sideways.

   
   

4. Lunar Craters Langrenus and Petavius

   The history of the Moon is partly written in its craters.

   
   

5. A Mercury Transit Sequence

   Tomorrow -- Monday --

   
   

6. Saturn the Giant

   On May 25, 1961 U.S. president

   
   

7. NGC 3572 and the Southern Tadpoles

   NGC 3572 and the Southern Tadpoles