... Last Thursday evening, stars were not the only lights in Iowa skies. ... A Force from Empty Space: The Casimir Effect . ... NGC 1055 and M77 . ... Large spiral galaxy NGC 1055 (top left) joins spiral M77 in this lovely cosmic view toward the constellation Cetus. ... Light Deposits Indicate Water Flowing on Mars . ... Images of the same parts of mid-latitude Mars taken over the years but released only last week have shown unexpected new light-toned deposits where there were none before. ...