by Father Sky
An extensive astronomy reference, beautifully illustrated and expertly written. The Firefly Encyclopedia of Astronomy is organized A-Z with concise details on each topic. The pages are profusely illustrated with vivid computer graphics, photography and archival images. Included are accessible contributions by 650 world-leading astronomers covering: History from the Big Bang to present Famous astronomer bios [...]
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by Father Sky
What creates these picturesque dark streaks on Mars? No one knows for sure. A leading hypothesis is that streaks like these are caused by fine grained sand sliding down the banks of troughs and craters. Pictured above, dark sand appears to have flowed hundreds of meters down the slopes of Acheron Fossae. The sand appears [...]
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