On the Cover:
This color composite of multi-spectral Landsat images reveals a huge, previously undetected crater in Egypt’s western desert, near the border with Libya. The outer rim of the double-ringed crater is 31 kilometers (about 19 miles) in diameter, making it the largest crater-shaped feature in the Great Sahara of North Africa.
Boston University Center for Remote Sensing
Volume 26, number 4
A Mystery Solved
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(Planetary Society members only)
6 Don't Abandon Science at NASA: Charles Kennel stresses that we need to commit to a strong sicnece rpogram at NASA to better know our planet and its place in the cosmos.
10 Veiled Crater in the Eastern Sahara: Farouk El-Baz and Eman Ghoneim tell their tale of discovering a massive impact crater in the Sahara.
16 Interstellar Dust: The Hunt for the Building Blocks of the Universe: Amir Alexander sheds some light on these elusive particles.
3 Members' Dialogue Metric vs. standard
4 We Make it Happen! Expedition to Europa on Earth; Shoemaker NEO grants
8 World Watch Save Our Science (S.O.S.) campaign update
20 Q&A How do we measure things on other planets? Does cold weather affect telescopes?
22 Society News Planetariums and Planetary Radio
An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.
Pretty pictures and