The total value of an artist’s artworks sold at auction over a specific period. This metric reflects the artist’s overall market activity and demand in monetary terms. The middle value of all realized ...

For the first time, astronomers have captured direct images of Neptune's elusive auroras. Scientists have long suspected that the distant ice giant hosts shimmering light displays, based on ...

The photo at left is an enhanced-color image of Neptune from the Hubble Space Telescope. At the right, that image is combined ...